Release v0.2.2

v0.2.2 release:

 * [#91](https://github.com/linkedin/hopscotch/pull/91) Don't cache step targets - support for single page apps
 * [#96](https://github.com/linkedin/hopscotch/pull/96) box-sizing: content-box - Issues with Bootstrap 3
 * [#90](https://github.com/linkedin/hopscotch/pull/90) Prefer jQuery and Sizzle when searching for a target
 * [#94](https://github.com/linkedin/hopscotch/pull/94) Catch exceptions caused by illegal targets in