Update client.rst
change addPostField to setPostField

seems that addPostField is or was deprecated?
Merge pull request #43 from natmchugh/master

Correct Namespace of Class in FAQ
Merge pull request #44 from pscheit/patch-2

change addPostField to setPostField
Merge pull request #45 from rukbat/patch-1

Update client.rst
Small typo fix in the BackoffPlugin

Hi guys!
Merge pull request #46 from weaverryan/patch-1

Small typo fix in the BackoffPlugin
Fixed default command parameter documentation

It's either this, or telling people to use Client::COMMAND_PARAMS, surely?
Fixed small typo in request options
Merge pull request #48 from rodolfo42/patch-1

Fixed small typo in request options
Merge pull request #47 from rexxars/patch-1

Fixed default command parameter documentation
Removed extraneous `new` statement.
Merge pull request #49 from morrisonlevi/patch-1

Removed extraneous `new` statement.