[ZEPPELIN-2520] DON'T set bottom margin for markdown table

[1ambda]

What is this PR for?

DON'T set bottom margin for the markdown table.

Implementation Details

that's because .paragraph table overwrites .markdown-body table

What type of PR is it?

[Bug Fix]

Todos

• - Bump version up from 2.4.0 to 2.6.0
• - Update bin_license/LICENSE
• - Import it using commonjs
• - Fix paragraph.css

What is the Jira issue?

ZEPPELIN-2520

How should this be tested?

1. Build: mvn clean package -DskipTests;
2. Execute a paragraph using this text.

Colons can be used to align columns.

| Tables        | Are           | Cool  |
| ------------- |:-------------:| -----:|
| col 3 is      | right-aligned | $1600 |
| col 2 is      | centered      |   $12 |
| zebra stripes | are neat      |    $1 |

There must be at least 3 dashes separating each header cell.
The outer pipes (|) are optional, and you don't need to make the 
raw Markdown line up prettily. You can also use inline Markdown.

Markdown | Less | Pretty
--- | --- | ---
*Still* | `renders` | **nicely**
1 | 2 | 3

Screenshots (if appropriate)

Before

After

Questions:

• Does the licenses files need update?
• Is there breaking changes for older versions?
• Does this needs documentation?

[1ambda]

CI failed but irrelevant.

• https://travis-ci.org/1ambda/zeppelin/jobs/230590633

Found the same errors in 4 different PRs

• https://travis-ci.org/1ambda/zeppelin/jobs/230590633
• https://travis-ci.org/1ambda/zeppelin/jobs/230549655
• https://travis-ci.org/1ambda/zeppelin/jobs/230235896
• https://travis-ci.org/1ambda/zeppelin/jobs/230215694

might be related with #2300

[soralee]

Nicely fixed bug and improved things!
Let me test and give you feedback!

[soralee]

Tested and it's work well.
My result are exactly same the above after and before screenshots.
LGTM.

[Leemoonsoo]

LGTM and merge to master if no further comments.