This adds `./test-in-docker` for quickly playing with various frameworks.
All the containers are based off Ubuntu 14.04 which has ZSH 5.0.2.
Thanks to @dritter for figuring out all the framework installation
methods.
- Used ZSH built-in magic to get the installation directory.
- Works with symlinks.
- No longer calls out to external program 'dirname'.
- Fixed issue with spaces in the path.
- No longer leak the variables 'filename' and 'script_location'.
The newline segment will now show ├─ when using
`POWERLEVEL9K_PROMPT_ON_NEWLINE`
Note: This can be overridden via `POWERLEVEL9K_MULTILINE_FIRST_PROMPT_PREFIX`