Adds a flash policy server.

The Flash fallback doesn't work when using TLS because Flash sends
a request for it's cross domain policy in the clear over a socket that's
supposed to be encrypted.
However, Flash also checks the port 843 for a policy file. This commit
adds an optionnal command line parameter to start a simple TCP server serving
the policy file.
Update Gems. Adds JSON Gem.

JSON Gem 1.7.7 added to fix CVE-2013-0269
Merge branch 'develop' of github.com:tech-angels/slanger into develop

Conflicts:
	Gemfile.lock