Twitter plugin: Deactivate follows by 403 users

Added fix to class.TwitterCrawler.php and added a method to
class.TwitterAPIAccessorOAuth.php to return the numeric error code the
Twitter API returns.
Added additional test data to tests/ to for the new tests to consume.
Closes #1742, closes #1677
Gracefully handle links and links_short table 'Data too long for column' errors, closes #1529
[DB MIGRATION REQ'D] Add Daily and weekly insight email notifications

Adds notification_frequency setting to Owners,
adds to DAO, Model and Interface.
Adds ability to set frequency on account page.
Adds mandrill template option to InsightsGenerator plugin for future.
Sends email after insights generation if user is an admin.
Generates email and subject from smarty template.
Added tests for insights generator plugin controller.
Added tests for new owner features.
Added tests for crawl and email sending.
References #1589, closes #1770
Commenting out PHP 5.2 incompatible strtotime calls in test till we convert them
Correct commented-out tests from b0b33a97f6f6db94d9b0266f5fb663175499f275
Fix InsightsGenerator test for PHP5.2

testBothSendSetting and testWeeklySendSetting updated to properly reference
constances by class name, not instance.
Merge pull request #1778 from cdmoyer/Fix-tests-of-insightsgenerator

Fix InsightsGenerator test for PHP5.2
[DB MIGRATION REQ'D] Add Photo support
With contributions from @nilakshdas, @aaronkalair, @ginatrapani
[DB MIGRATION REQ'D] Add permalink to posts table
Add support for sending HTML email via Mandrill templates
Added Mailer::mailHTMLViaMandrillTemplate

Sends via mandrill.
Passes in parameters as merge_vars
Closes #1772, closes #1777
Insight name/description copy tweaks