Add documentation for adding office and party metadata

Addresses openelections/core#61
Merge pull request #1 from ghing/metadata_loading

Add documentation for adding office and party metadata
bash markdown
Write loader docs and tweak transform/validate 

Flesh out loader docs and update transform/validate to reflect upcoming changes from rawresult branch (mainly the ability to register one or more validations with a transform).
added details on mappings and fleshed out other sections
tweaks
added to manual process section
Link to the live docs
Merge pull request #2 from aubergene/patch-1

Link to the live docs
removed bash md syntax
Merge branch 'master' of github.com:openelections/docs
fixed metadata API link
syntax highlighting for json, ignore _site, fix some markdown issues
various other backtick tweaks
fix how it talks about the directory you need to be in, and adds proper bash highlighting to everything
Merge pull request #3 from konklone/fixes

Adds/fixes syntax highlighting, corrects some invoke copy
docs are stale on subject of STDOUT of mappings
Merge pull request #4 from konklone/nostdout

Removes stale command about mappings to STDOUT