Ignore multiple references of components / version pattern change

[udondan]

• In case a bootstrap component is references multiple times within multiple *bootstrap.json files, it's still only added once. Merging support for multiple config files #8
• Change version pattern to better see which version of bootstrap is shipped. Package version #9 (I hope it's possible to publish it with this lowered version number)

[Nemo64]

Good idea, however there are some edge cases that aren't handled. It must be possible to edit the variable file custom.bootstrap.import.less. I assume that it isn't possible like that as you have your own import.less with variables in the package then. This would mean that if I edit variables, I'd have different custom versions of bootstrap mixed together.

Maybe there needs to be another kind of json file that does not generate anything but adds modules to the compilation at the end. I currently think about something like a package.bootstrap.json or similar. One problem with that though is that the developer at the end MUST create his own custom.bootstrap.json in order for the final files to be generated.