Added basic rails 4 support
Fix for rails 4 session object
Allow failures in 1.8.7
Use ActiveSupport::JSON, and deflate post requests
Update gem homepage
Bump to v0.5.4 [ci skip]
Merge branch 'master' into develop

Conflicts:
	lib/appsignal/version.rb
Use strings instead of symbols for content-types, symbols are not accepted
Use strings instead of symbols for content-types, symbols are not accepted
Don't require CLI in main appsignal gem
Do not use Rails delegate method
send_exception and listen_for_exception methods added
Move duplicate code to AuthCheck and increase test coverage
Remove unused code environment_setup?
Merge branch 'zlib_log_entries' of github.com:80beans/appsignal into zlib_log_entries
Load rails when it's available but raise when it can't be found
Remove unused method new_template_content

I think it was used to repeat a template's content to create multiple environments in the config file, but this is now done in ERB
Merge branch 'master' into zlib_log_entries
American spelling
Don't rely on Transaction.current, we know the transaction being created