Remove not used files.

Signed-off-by: Walter Souto <wsouto@gmail.com>
Update information.

  * Remove all MacOS specific notes since I have no Mac anymore.
  * Remove RVM and rbenv specific notes.

Signed-off-by: Walter Souto <wsouto@gmail.com>
Remove custom bashrc since it's not needed for Linux.

Signed-off-by: Walter Souto <wsouto@gmail.com>
Change file extension

Signed-off-by: Walter Souto <wsouto@gmail.com>