Bumping version to 2.2.18

Updating Changelog for 2.2.17

Merge branch 'release/2.2' of github.com:bolt/bolt into release/2.2

Bumping version to 2.2.15, the last release of 2015.

Bumping version to Bolt 2.2.14

Rendered JS + CSS

Bumping version to 2.2.11 for release.

Bumping version number to 2.2.10 (for Doctrine patch release)

Merge pull request bolt#4026 from GawainLynch/hotfix/changelog-routes

[2.2] Fix changelog single item links

Bumping version to 2.2.8 for release