Merge pull request #25 from parrisvarney/master

Adding optional "base_url" authentication parameter for newer users.
API for OptionList
Fixed a doc and comment error
Fixed "back to nav" issue in doc
Fixed test case name
Merge pull request #27 from parrisvarney/OptionList

Adding support for OptionList CRUD and search operations.
Adding option list to the docs index. [ci skip]
Merge branch 'master' into CustomObjects

Conflicts:
	doc/index.md
	src/Client.php