changed the names of the server Rake tasks because they conflict with
the Bundler::GemHelper rake tasks.

it is often convenient (or necessary) to build the calabash-cucumber
gem locally.  using the Bundler::GemHelper:

rake install

however the 'install' task is overridden by the build_server, which is
not ideal
Merge pull request #173 from jmoody/0.9.x-rename-rake-task-for-GemHelper-compat

renamed the rake tasks for building the server to be compatible with Bundler::GemHelper install/build/release