Merge tag 'v0.2.3' into develop

Version 0.2.3

* Fix overly strict and unspecified dependencies
rdoc ~> 4.1
bundle update
Use rspec-collection_matchers
Use rspec-its
Use let and double
use be_truthy and be_falsey
purged option parsing from bin/rimv
Purged mode execution code from CLI.parse
cli spec

CLI.parse [-a] should invoke mode `add'
Rimv.mode

set/get application mode
Require rimv.rb from rimv/cli.rb
Bugfix on CLI.parse

CLI.parse now parses argument argv, not constant ARGV
CLI.parse: default argument=ARGV
Reset Rimv.mode after testing CLI.parse
cli spec

CLI.parse [-v] should invoke mode `view'
cli spec

CLI.parse [--add] should invoke mode `add'
cli spec

CLI.parse [--view] should invoke mode `view'
define class Rimv::Application
Change class variables to instance variables