Add toolbox doc

Closes #28

Place for standard development env setup and useful tools. It would be
nice to add or at least link short howto for each position.
Strip whitespaces
Configure editor to strip trailing whitespaces

I've got config for vim and sublime. Any others are welcome.
Merge pull request #59 from monterail/toolbox

Add toolbox doc
Merge pull request #64 from monterail/feature/strip-whitespaces

strip trailing whitespaces configuration