'Init' feature initial implementation

Added the init() proc to babel.nim as well as a new TActionType and
supporting code in doAction.  The idea is that if you have a project
already created in a directory, this will create a .babel file with
sane defaults.  I also updated the help text describe the 'init'
feature as with the other babel commands.
Style changes, fix some bugs, raise exceptions

Did some cleanup to better match style conventions, switched out 'quit'
statements in favor of raising 'EBabel' exceptions, used writeln, and
other cleanup.

See
https://github.com/nimrod-code/babel/pull/58
Merge pull request #58 from singularperturbation/master

'Init' feature initial implementation