Fix for settings page to retain measurement unit dropdown.

* Bug fix for duplicate shared sessions posts.
* Updated links
* Fix for kph to km/h for metric

replaced buttons with images

* Added comments and likes to sharing page
* Added display name to settings
* Added toggleable profanity filter for posts and comments
* Fix for Black Belt Metric "Stop Less than..." image incorrectly showing imperial measurements.
* Typo fix for Snowman drill for metric.

* Fixed wording in Blue Belt drill for parking spaces.
* Added version to the settings page.
* Fixed intermittent bug that didn't populate name in new post form.

* Added sharing practice sessions
* Added demonstration videos for the second volume
* Added additional images in second volume to show direction
* Fixed name typos

* Added metric conversions for all images and drill descriptions and settings page to change.
* Improved drill pictures quality / resolution.
* Bug fix for video link in knowledge.
* Improved text formatting for drill instructions.

Adjusted book images for any width display. Fixed all titles to have quotes, fixed some text spilling off in some resolutions.