Merge branch 'release/v1.1'
Merge branch 'release/1.2'
Fixed Crashes in Win64

Fixed bug which causes crashing in windows 64 bit
Fixed Compilation issues

Fixed some compilation issues
Merge git://github.com/gabgoh/spot into feature/windows_mex
Remove asv file.
Fix mex compilation for Windows.
Merge branch 'feature/windows_mex' into develop
Overloaded the sum function

Added overloaded version of sum, to compute row and column sums
of Spot operators.
Added unit test for sum operator
Overload sum.
Minor changes to opFunction docs.