remove using wrappers, fix #13, fix #14

[mpapis]

switch to detect the binaries at runtime using rvm ruby do binary - this eliminates the need to create wrappers which solves:

• 13 - no need to write anything

• 14 - no need to check application for creating wrappers

[kirs]

It's a nice feature and it simplifies RVM integration a lot, but I think we need more testing by users.

[mpapis]

I also think it needs more testing, but this is one of basic features of rvm so I do not expect problems,

it will also allow adding flags like --create and --install:

rvm ruby@gemset --create --install do binary

[Kriechi]

@mpapis could you please updated the readme according to your changes. (once it's tested enough and your proposed solution works)

[Zeophlite]

I'm using this PR in my production code, so +1 for pulling

It integrates well with capistrano/bundler/pull/6

[Kriechi]

:+1: for pulling

[kirs]

Thanks for testing! I've pushed 0.0.3 version of the gem and it's ready to use :blush: