0_path.zsh reinserts .yadr paths twice in tmux

in terminal
```sh
sky@nimbus ~ $ echo $PATH 
/Users/sky/.rbenv/shims:/Users/sky/.rbenv/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/X11/bin:/Users/sky/.yadr/bin:/Users/sky/.yadr/bin/yadr
```

in tmux

```sh
sky@nimbus ~ $ echo $PATH
/Users/sky/.rbenv/bin:/usr/local/bin:/usr/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/X11/bin:/Users/sky/.rbenv/shims:/Users/sky/.yadr/bin:/Users/sky/.yadr/bin/yadr:/Users/sky/.yadr/bin:/Users/sky/.yadr/bin/yadr
```
Update docs
If you don't use a solarized terminal, you have to set g:yadr_using_unsolarized_terminal now [Ref #487]
Explain how to deal with unsolarized terminals in docs
Add the agnoster prompt, with customizations
Merge pull request #497 from Sumukh/master

Added the Agnoster prompt as an option.
Merge pull request #506 from padi/patch-1

0_path.zsh reinserts .yadr directories twice in $PATH when in tmux
Get rid of heavy omni complete - seems to hang on some machines
Add vim command for updating current working directory
Add OSX keychain helper for git credentials
Include additional plugins
Switch to hybrid line numbering
Reduce VIM default window size
Make Google Chrome the default preview app
Add ability to upload git achievements to live gh-pages branch
Add Taskwarrior support
Update prezto
Modified prezto
Add support for Dash
Add support for lorem ipsum