[DB MIGRATION REQ'D] Fix count history indexes
Fix bug where multi-column indexes caused inconsistent query results
Clean up tests, standardize milestone threshold to 20
Correct migration (remove rollback, fix type insertion)
Fix case in file paths
Favorited Links Insight
Closes #1615, closes #1665
[DB MIGRATION REQ'D] Fix Twitter crawler bug that didn't set in_reply_to_user_id
Migration backfills existing rows with incomplete data
Speed up migration; use in_reply_to_user_id_str
Only run new SQL without version numbers in the files when upgrading --with-new-sql
Update documentation on connecting with Foursquare
Fix upgrade.php --with-new-sql failures on source with database migrations

Prior to this commit, when a developer pulled the source code and there was a database migration since the last stable release, php upgrade --with-new-sql potentially failed because that migration was already published in build-db_mysql.sql, which was already run during installation.

This commit reverts build-db_mysql.sql to the latest version release, and creates a new script, build-db_mysql-upcoming-release.sql, which tests use. When the developer installs from source, s/he must also then run php upgrade --with-new-sql afterward, which will apply any pending migrations which have not gone out in a new user release.

From now on, when a new user release gets packaged up, every change in the upcoming-release sql script will get rolled into build-db_mysql.sql.
Fixes #1662 - Interaction Graph insight bugfix
Localized network terms in insight language
Clean up whitespace and use Google-style +1'd
Updated Font Awesome to the latest version
Interaction Graph insight bugfix
New insight: Long-lost contacts
Closes #1463, closes #1664
Response Time insight copy fixes
Closes #1670, closes #1700
New link list insight attachment template
Closes #1665, closes #1705
Get 12 followees replied to instead of just 5
Alter prefix for reply spike and word frequency insights
closes #1695, closes #1699
Fixes #1661 - Added hot_posts_data to Weekly Bests insight attachment