Improved --enable option, accepts passing arguments

Improved the `--enable` option to work better with existing post-commit hooks.  Any additional args after the --enable option are passed through to the --capture command within the hook.  

For example calling;

    lolcommits --enable --animate=5 --fork

would result in the following capture hook

    #!/bin/sh

    ### lolcommits hook (begin) ###
    export PATH="/Users/xxx/.rbenv/versions/2.0.0-p247/bin/ruby:$PATH"
    lolcommits --capture --animate=5 --fork
    ###  lolcommits hook (end) ###

* added a feature to test the lolcommits hook enabling with args
* added lolcommits comments before and after the hook commands
* tests are green