Add a bug report template. (DO NOT MERGE) (progit#1244)

* Update issue templates

* Add checklist.

* Add link to translation projects.

* Replace list with table.

* Add Javascript comments, add punctuation.

* Remove unnecessary capitalization.

* Remove unnecessary capitalization.

* Add guidance on steps to reproduce.

* Add note to refence other bugs.

* Add how-to mark checkbox with Github Markdown.

* Change text to be more descriptive.

* Fix Javascript comments for list.

* Add colon.

* Add Javascript comment.

* Remove backticks.

* Add checkbox, fix text.

* Create inline links.

* Add section on e-book readers.

* Fixes, see description below

Add note about not supporting epub or mobi formats.
Add bold markdown to emphasize what the bug should not be about.
Move translation project to own line and add checkbox.

* Add application.

* Add application.

* Fix comment.

* Add checkbox/selector for pdf/website.

* Remove text.

* Fix indentation.

* Fix indention for all list items.

* Change wording for checkbox.

* Change wording for pdf/website cross-check.

* Convert checkboxes to list items.

* Convert checkbox pdf/website to a question.

* Rewrite text to better fit list format.

* Rewrite pdf/website question.

* Fix grammar.

* Remove line about not accepting .epub/.mobi bugs.

* Expand list to include epub/mobi files.

* Clarify why we need the source/file comparison.

* Add comment for device detail forms.

* Add horizontal rulers. Move context section up.

* Comment out checklist. Remove ruler.

* Add colon to headers.

* Remove horizontal ruler.

* Remove e.g.

* Squash comments into one comment above each list.

Merge pull request progit#1245 from HonkingGoose/issue_590

Fix ambiguity around tree object.

Merge pull request progit#1246 from bripmccann/patch-1

Reword sentence about losing local changes

Merge pull request progit#1243 from HonkingGoose/ubuntu_1404_removal

Remove ubuntu 14.04 and upstart.

Merge pull request progit#1242 from HonkingGoose/issue_609

Agile/scrum user-story fix.

Merge pull request progit#1241 from HonkingGoose/bulgarian_translation

Add Bulgarian translation project.

Merge pull request progit#1240 from HonkingGoose/arabic_translation

Add Arabic translation.

Merge pull request progit#1239 from HonkingGoose/persian_translation

Add Persian translation project.

Merge pull request progit#1236 from aollier/git_config

Show settings and additional information.

Merge pull request progit#1233 from aollier/one_sentence_per_line

One sentence per line