Cache Jira @_field_mapping
RSpec defaults
RSpec uses spec/ directory
Remove 1.8.7 from Travis CI build file
Overhaul #search and #count, use #get/#post
Back up to 100% statement coverage
When saving an issue, merge updates into data
More help in README, #save to #save!
Spec for RequestTimeout (back to 100% coverage)
Add #path_with_query and specs; use it

This allows GET/DELETE/HEAD to more easily include params.
Specs for Issue and JSONResource
New Jira#enumerator method

Also tidy up specs
More specs, debug support for JSONResource
Remove fake stuff from pry.rake
Raise ArgumentError for empty key
Add InvalidField exception
Class variables
Enumerator specs (multi-page and exception)
YARD for docs
Ignore generated documentation dirs