Added a macro to calculate the mean of an array of data, and another
macro to calculate the standard deviation of an array of data.
Merge pull request #14 from discnerd/master

Descriptive Stats macros
Merge pull request #15 from aubreyja/master

Cleaned up code in parserMultiAnswer.pl and unionTables.pl that was causing a lot of spurious and unattributed messages to be written to the error log.
Fix typo in comment.
Add parserFunctionPrime.pl macro file that implements prime notation for parserFunction objects.
Merge pull request #16 from dpvc/master

Add parserFunctionPrime.pl macro file
Remove 'defined' from deprecated defined(@array) in MathObjects (resolves issue #17).
Merge pull request #18 from dpvc/master

Fix problem with defined(@array) in MathObjects
Use getVariableLimits to get limits for diagnostic graphs (so that they are handle the same way as the answer checking itself)
Merge pull request #19 from dpvc/master

Fix diagnostic graphs to use correct limits when specified in context
Fix some typos in the comments for PGML.pl
Prevent loading PGML.pl from setting the context to Typeset
Fix typos in comments for parserFormulaUpToConstant.pl
Add new parserFormulaAnyVar.pl file to allow formulas that a student can enter using any variable name
Merge pull request #20 from dpvc/master

Prevent loading PGML from setting the context to Typeset context
'my' variables  and  masked earlier declarations, resulting in error log file pollution
Put contextLimitedPolynomal and contextInequalities back into one file (since the problem that caused these to be broken into separate pieces was resolved by SHA d636150 in openwebwork/webwork2-dev).  Note that these libraries need to be removed from the library list in the configuration file for webwork2.
Merge pull request #21 from dpvc/package_errors

Put contextLimitedPolynomal and contextInequalities back into one file
fix spelling
Merge remote-tracking branch 'openwebwork-dev/master'