Improved autocorrelation routines to work on multidimensional arrays.
Fixed a bug with multidimensional ACF calculations.
Removed a debugging line that shouldntve been there.
Updated .gitignore.
Merge remote-tracking branch 'upstream/master'

Conflicts:
	plotutils/autocorr.py
Fixed bug in N-dimensional ACF code.
Merge pull request #1 from willvousden/nd-autocorr

N-dimensional ACF calculations