Update rails_best_practices.gemspec

awesome_print seems not used by rails_best_practices so it not needed and should be installed only as a development tool in order to avoid install it with rails_best_practices.
Merge pull request #229 from zedtux/patch-1

Update rails_best_practices.gemspec
There is no such method as remove_line_number_and_column in code_analyzer gem.

`remove_line_and_column` is the correct method name.
`remove_line_number_and_column` always returns `nil`
See: https://github.com/flyerhzm/code_analyzer/blob/master/lib/code_analyzer/sexp.rb#L862
Merge pull request #230 from maksar/patch-1

There is no such method as remove_line_number_and_column in code_analyzer gem