[crontab] Change crontab parser and test.

Changed for new node's comment style. Now, comments attach to nearest
to down not comment line. Last comment lines attach to root node and after
stringify rise to begin of file. Changed test for inheritance from BaseParsertest.
Merge branch 'master' of https://github.com/Eugeny/reconfigure into HEAD
[crontab] Fix duplication node problem.
[crontab] Add crontab items, config and tests.

Added crontab items description and change builder for "bind" style.
[git] Add pycharm folder to gitignore.
Merge pull request #4 from Bryukh/master

crontab