Changed language parameter variables

Parser classes now accept an array of language parameters and only set
the variables they need.
Changed language parameter variables

WikiExtract class now accepts an array of language parameters and only
sets the variables it needs.
Update to Readme 0.3a

Changelog. Updated instructions on adding language functionality.
Changed parameter settings.

Language parameters are now set via an array.
Wikparser 0.3a

Language parameters are now included in an array, which is passed to
individual parsers.