PasswordStrengthRegularExpression bug fixed, ValidatePasswordStrength re-factored 

1] while PasswordStrengthRegularExpression checking using IsMatch method, the input password was passed as second param and pattern was passed as first param. IsMatch requires input as first and pattern as second param.

2] Re-factored ValidatePasswordStrength code from SetPassword method, making it more readable.
IE cached ajax response as noted in Issue 422

IE cached ajax response as noted in Issue 422. 

"When using IE 10.0.9200.16580 and I click Generate for a new Symmetric Signing Key, I continually have the same key returned for all of the different RPs.

This is not an issue in Chrome, where I get a new key every time I click the button."
IE cached ajax response as noted in Issue 422 Update

Fixed the issue of missing comma in script. The issue got created while fixing as per subject.
Merge branch 'jd4u_master'
Added TestCategory = Integration attributes to all test methods in integration test fixtures
add linked in oauth2 support
Merge pull request #445 from larsw/testcategory-on-integration-tests

Decorated all test methods in integration test fixtures with [TestCategory("Integration")] for better filtering
added sample that uses MembershipReboot to implement identity management
added reference to core and added nuget restore
Changed methods to virtual on ProviderUserRepository