Pin required library versions

[justb4]

To make sure that GHC always works in any context, it is recommended to "pin" versions of external mainly Python libs. In some cases, incompatible versions may cause subtle, hard-to-debug errors like this one, caused by mismatch of Flask-Login versions and the use of user.is_authenticated() (switched from function to bool from 0.3.0).

This is a list known to work for GHC version as on July 14, 2017 for the "dev" version within Docker using gunicorn/eventlet and PostGIS via psycopg2:

(venv) bash-4.3# pip list

alabaster (0.7.10)
alembic (0.9.3)
Babel (2.4.0)
certifi (2017.4.17)
chardet (3.0.4)
click (6.7)
docutils (0.13.1)
enum-compat (0.0.2)
enum34 (1.1.6)
eventlet (0.21.0)
Flask (0.12.2)
Flask-Babel (0.11.2)
Flask-Login (0.2.11)
Flask-Migrate (2.0.3)
Flask-Script (2.0.5)
Flask-SQLAlchemy (2.1)
greenlet (0.4.12)
gunicorn (19.7.1)
idna (2.5)
imagesize (0.7.1)
itsdangerous (0.24)
Jinja2 (2.9.6)
Mako (1.0.6)
MarkupSafe (1.0)
OWSLib (0.14.0)
Paver (1.2.4)
pip (9.0.1)
psycopg2 (2.7.1)
Pygments (2.2.0)
pyproj (1.9.5.1)
python-dateutil (2.6.0)
python-editor (1.0.3)
pytz (2017.2)
requests (2.18.1)
setuptools (36.0.1)
six (1.10.0)
snowballstemmer (1.2.1)
Sphinx (1.6.3)
sphinxcontrib-websupport (1.0.1)
SQLAlchemy (1.1.11)
typing (3.6.1)
urllib3 (1.21.1)
Werkzeug (0.12.2)
wheel (0.29.0)

[justb4]

On nov 6, 2018 master branch:

(venv) bash-4.3# pip list
Package                  Version   
------------------------ ----------
alabaster                0.7.12    
alembic                  1.0.2     
APScheduler              3.5.1     
Babel                    2.6.0     
certifi                  2018.10.15
chardet                  3.0.4     
Click                    7.0       
dnspython                1.15.0    
docutils                 0.14      
enum34                   1.1.6     
eventlet                 0.24.1    
Flask                    0.12.4    
Flask-Babel              0.11.2    
Flask-Login              0.2.11    
Flask-Migrate            2.0.3     
Flask-Script             2.0.5     
Flask-SQLAlchemy         2.1       
funcsigs                 1.0.2     
futures                  3.2.0     
greenlet                 0.4.15    
gunicorn                 19.9.0    
idna                     2.7       
imagesize                1.1.0     
itsdangerous             1.1.0     
Jinja2                   2.10      
Mako                     1.0.7     
MarkupSafe               1.1.0     
monotonic                1.5       
OWSLib                   0.17.0    
packaging                18.0      
Paver                    1.3.4     
pip                      18.1      
psycopg2                 2.7.5     
Pygments                 2.2.0     
pyparsing                2.3.0     
pyproj                   1.9.5.1   
python-dateutil          2.7.5     
python-editor            1.0.3     
pytz                     2018.7    
requests                 2.20.0    
setuptools               40.5.0    
six                      1.11.0    
snowballstemmer          1.2.1     
Sphinx                   1.8.1     
sphinxcontrib-websupport 1.1.0     
SQLAlchemy               1.2.13    
typing                   3.6.6     
tzlocal                  1.5.1     
urllib3                  1.24.1    
Werkzeug                 0.14.1    
wheel                    0.32.2    
WTForms                  2.1

[justb4]

Pinned all Python dependencies for reproducible build/installs and pinned/upgraded Docker image to latest python:2.7.15-alpine3.8.