Moved tooltriggerevents into the tool#6

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OceanWolf wants to merge 65 commits into

fariza:navigation-by-eventsfrom

OceanWolf:navigation-by-events-from-tool

Commits on Feb 4, 2015

Commits on Feb 11, 2015

Commits on Feb 12, 2015

Moved tooltriggerevents into the tool.
OceanWolf
committed
Changed name of event from `tool_state_changed` to `tool_triggered`
OceanWolf
committed
Moved event firing to source, i.e. to the trigger method. Now one must override the _trigger method instead.
OceanWolf
committed