Merge pull request #5 from openwebwork/develop

Bring the develop branch up to date with the main repo
Added to documentation.
Merge branch 'develop' of git://github.com/openwebwork/pg into develop
Merge pull request #62 from mgage/develop

Merge changes made to pg release/2.8 into pg develop branch
Merge branch 'develop' of git://github.com/openwebwork/pg into develop
Merge branch 'develop' of https://github.com/openwebwork/pg into develop
Merge pull request #67 from mgage/develop

Add _init function to contextTypset
If a problem value is negative, then don't display points (used in library browser).
Merge branch 'develop' of git://github.com/openwebwork/pg into develop
Merge branch 'master' of http://github.com/openwebwork/pg into dev

Conflicts:
	macros/PGessaymacros.pl
Merge pull request #69 from jwj61/develop

Hiding point values in library browser
Merge pull request #74 from goehle/dev

Merge from Master
Merge pull request #8 from openwebwork/develop

Bring develop up to date.
Changed the routine that generates a Bernoulli random variable to return optional values for success vs failure.
Merge pull request #82 from KellyBlack/black_dev

Change the generation of a Bernoulli generated random variable to also include optional values to return.

I checked the old functionality and the new functionality.  Both seem to work.
Added a subroutine to generate random results from a discrete probability mass function.
Merge pull request #10 from openwebwork/develop

Develop
Merge branch 'develop' into black_dev
Merge pull request #88 from KellyBlack/black_dev

Add a new routine to generate data from a probability mass function.
Fixed a bug with variables in PGstatisticsGraphMacros.pl not being properly defined.