Make the .min file selection work.

Test the cli command.
Add `cInstall > option > min` support in bower.json

Also update documentation.
Repair the CLI commands call. Before the CLI section was call as soon as we require the clean-bower-installer module, now it not.

Also :
* Add travis and david tag in README.md
* Test on Linux
* Test new API functions
* Upgrade package version
Corrections to README.md

Also:
* Change API export code style.
* Add default folder option for minimized file (option > default > minFolder).
* Upgrade the way the options from the bower.json file was read.
Merge pull request #2 from ofrogon/getMinVersionOption

Get min version option