run all tests, including plugins tests, on travis

Adding travis badge

❯❯❯ Complete overhaul of brand new Oh-My-Fish `fish-spec` test framework.

+ Add documentation and examples.
+ Add new functions to interact with the framework:
  + spec.eval - eval a function by name and echo its description field
  + spec.functions - prints functions currently in scope that match the key glob
  + spec.log - log a message / test result
  + spec.run - run suite of tests
+ Rename list.erase to erase.

Add travis support via .travis.yml and bash bootstrap script.

Improve install.fish

  + Non-interactive terminals, e.g., skip launching fish when
    running tests automated, etc.
  + Non-git-based installations. If git is not found, download
    via curl HTTP GET download request.
  + Installing forks of the framework.
Also:
  + Improve documentation.
  + Fix bug in un escaped backslash causing incorrect syntax
    coloring after the ASCII fish logo.

+ Extend to support any number of items and/or lists.
+ Add --from option.

Add msg plugin. The technicolor message printer.

Add notes in comments about escaping.

  + msg.util.get.color.fish
  + msg.util.random.color.fish
  + msg.util.set.color.fish
  + msg.util.str.get.fish
  + msg.util.str.has.fish

 + Print messages with style and color easily. Supported styles below:

     _text_                 Bold
     __text__               Underline
     ___text___             Bold and Underline
     `$variable`            Apply @<styles> to $variables
     /directory/            Directories
     [url]                  Links
     \n                     Line Break
     \t                     Tab Space

 + Recognizes 256 different color names and special @random @light @dark @error and @success labels.
 + Included also is `msg.ask` to print a message with `msg` and wait for y/n input. Returns true on y\*.

[feat-import] + import command, ⁑ bad wildcard expansion bugfix in _prepend_tree.

To import plugins or load themes:

 + import plugins/<plugin>
 + import plugins/{dpaste,cask} themes/bobthefish

Note: Plugins/Themes can be in either `custom/plugins`, `custom/themes` or `$fish_path/plugins/`, `$fish_path/themes/`.