fasd 0.5.4 plugin

The [fasd](https://github.com/clvv/fasd) project replaces the current
z() functionality, and generalizes it for all files and directories.

It provides a 'z' alias which works like z() does today, but faster, as
well as 'f' for selecting files, and 'd' for selecting directories, all
based on 'frecency' with Bayesian inference calculations. It is also
trivial to set up a 'v' alias to edit frecently used files.

Seriously, two points just for using Bayes' theorem.

I've sourced this as a plugin, and made a minor modification to @clvv's
0.5.4 file to bootstrap the initialization process without installing
fasd outside of Bash_it, or modifying the PATH.

This doesn't fully install fasd on a system (for instance, the man page
is not installed).

Using this as a plugin will clobber the z plugin.

This also installs a PROMPT_COMMAND hook. I don't have a complex setup,
but it is possible this may not play nice with other PROMPT_COMMAND
hooks if they are set. It seems to work well on my box.

As an aside, it appears that z.bash is out-of-date compared with @rupa's
latest code.
update alias directory
Merge remote-tracking branch 'erichs/fasd'
plugin-specific metadata

cite about-plugin metadata.  This could be retrieved later, say by an
install script or other helper function, with:

cat ~/.bash_it/plugins/enabled/base.plugin.bash | metafor about-plugin

In this way, summaries of each plugin may be provided to give newcomers
(like me!) an overview.

also, rewrote plugins-help(), which didn't work very well on my system.
It now dynamically queries composure metadata.
update composure
update plugin documentation
Fixed BASH_IT path in fasd configuration to use environment variable instead of fixed path.
Fixed reload by expanding environment variable before defining the alias.
Merge pull request #131 from nwinkler/fasd-bash-it-path

fasd is using fixed path instead of BASH_IT variable
updating git.completion.bash
Merge branch 'master' into plugin_metadata
fix bug in fasd init

since we're sourcing this as a plugin, which loads the function, it's
counterproductive to also define the 'fasd' alias

moving the about-plugin metadata into the case block makes this script
safe for execution even if composure metadata isn't exported and
available

rename fasd.bash to fasd.plugin.bash to bring it inline with the other
plugin scripts
update to latest version of composure.sh

this fixes a bug in draft() and improves performance in metafor()
and glossary()
basic plugin management

move plugin management functions into 'lib' group in helpers.bash
standardize plugins, update metadata

add about-plugin metadata
chmod -x plugins
cleanup filenames to standardize on x.plugin.bash format
only plugin files intended to be executable from the command line should
contain a shebang line, and should be a+x.
disable z() if fasd is enabled

loading fasd clobbers z(), and results in a cryptic syntax error
message, since 'z' is already an alias when z.plugin.bash is being
sourced.

this conditional detects this situation and returns early.
update plugin management
update help documentation
fix typos
Fix load_some() installation to handle file paths instead of names.

The ls command in for loop has a pattern now, so full paths are
returned. The user prompt and symbolic link have been updated to handle
this.

Also, not all plugins have '.plugin.' in the middle of their names and
weren't showing up on user prompt. With this commit, everything after
the first period in the file name is stripped.