Merge pull request #1 from zymsys/master

Start on some TDD and namespace / class structure
Added in PHPUnit as a development requirement
Fixed correct path to the autoloader
Removed unneeded test, we don't need to test that PDO returns what we expect
Added in autoloading support for OpenCFP-specific classes
Added in APP_DIR constant
Added new SignupForm object along with initial test
Added in test for validating email addresses entered by users when signing up
Added in test that passwords are being propery validated
Added in tests for validating first names
Added in validation for last name
Added in wrapper method for validating all signup fields
Added in support for HTMLPurifier
Now using HTMLPurifier to sanitize data
Added in test verifying sanitization works
Added directory with coverage reports to .gitignore
Finished up with validation methods, now have 100% code coverage in tests
Removed an unneeded require statement
Also removed some bootstrap magic that we don't need
Added in code and tests for a Speaker object