Close issues that are no longer needed

This is an empty commit to close issues and pull requests that were
opened some time ago and which the evolution of the repository have
made obsolete. The reason for closing is written next to the issue
to be closed.

If one of these issues or pull-requests is yours and you think it was
wrongly closed, just mention me in the issue with one of the comments
and I'll be available to discuss it.

 ### Obsolete PRs

Close #1095: already in the codebase.
Close #1816: git pull rebase is destructive.
Close #1962: LOL (no comment needed).
Close #1986: obsolete by recent changes to sublime text plugin.
Close #2205: agnoster theme already updated with new powerline fonts.
Close #2269: whole plugin for just one alias is not good.
Close #2300: agnoster theme already updated. Also, deletes important stuff.
Close #2689: chsh doesn't require root and shouldn't do by default.

 ### Solved or obsolete issues:

Close #1590: bug doesn't appear anymore (history related).
Close #1628: customization info already told. 'Helpdesk' issue.
Close #1852: weird description, non-responsive author. Also, zsh can already
read bash-completion scripts: http://bit.ly/1gsB9QZ.
Close #1896: fixed issue.
Close #2024: issue related to closed BFS (Big-Fat-Scary) PR #2025.
Close #2188: fixed issue.
Close #2213: non-responsive author.
Close #2216: wrong site to ask (python/pip support).
Close #2235: non-responsive author, issue not related to oh-my-zsh.
Close #2264: font issues are not oh-my-zsh related.
Close #2267: solved issue.
Close #2279: solved issue.
Close #2293: old issue (solved?).
Close #2294: solved (one) issue, non-responsive author.
Close #2336: git requirement is now explicited if git is not found.
Close #2513: duplicate issue of a PR to be checked.

 ### Pending themes

Themes are not accepted for now.

Close #1069, close #2348, close #2742.