updates rspec-rails

bumps version to latest, updates Gemfile and Gemfile.lock

fixes #49
Merge branch 'Imnudar-update-gem/update-rspec-rails'
updates guard-rspec

bumps version to latest, updates Gemfile and Gemfile.lock, adds binstub
for listen

fixes #51
Merge branch 'Imnudar-update-gem/guard-rspec'
updates sqlite3

bumps version to latest, updates Gemfile and Gemfile.lock

fixes #53
Merge branch 'Imnudar-update-gem/sqlite3'