Update README and include Travis badge.

* Clarify installation instructions.
* Closes #134.
Bump patch version and update CHANGELOG.
Bump Gemfile.lock's for new vanity version.
optimize metric_values query
Add Autoconnect singleton and determine Playground connection with it.

* Vanity will not connect to a database on initialization based on a blacklist of rake tasks or the environment flag VANITY_DISABLED.
* Refactor Playground#initialize to use #autoconnect.
* Closes #81.
Merge pull request #139 from zawaideh/patch-2

optimize metric_values query
Fix tests broken by Ruby 2.0.0 using timecop.

Conflicts:
	.travis.yml
	Gemfile.lock
	gemfiles/rails3.gemfile
	gemfiles/rails3.gemfile.lock
	gemfiles/rails31.gemfile
	gemfiles/rails31.gemfile.lock
	gemfiles/rails32.gemfile.lock
Finish ruby2.0 compatiblity with testing setup.

* Split out gemfiles in travis for explicit matrix.
* Update gemfiles for ruby2.0 compatibility
** rails/rails#9406 <- makes rails 3.2 Ruby 2.0 compatible, meaning the first version we'll test with and support is this
** Use older version of rubygems for rails 2 compatibility
* Update dummy rails3 test app and rails loading tests.
* Update passenger test will fallback Passenger SIGKILL: MySQL + Passenger 2 + Rails 2.3 + Ruby 1.8.7 seem to not close connections.
* Closes #131.
adding ability to set a function which is called when an identity is given an assignment in ab_test
changed to use new ab_seen function rather than calling ab_show to determine if the participant has seen something
fixed to work with redis and mongodb adapters
Turn on GC for clean up after AB Test tests.
Fix whitespace in AbTest.

Closes #112.
Add test coverage for Vanity usage in ActionMailer.

* Addresses #122.
* Refactors some of the rails framework for clarity.
changed to use new ab_seen function rather than calling ab_show to determine if the participant has seen something
fixed to work with redis and mongodb adapters
added Bayesian analysis capability to A/B test results
allows experiments to periodically use the Bayesian bandit calculations to rebalance the distribution of probability of each alternative in the split test