Merge pull request #2 from linacre/master

Add code for TopAFB analysis
Begin working on systematics
add Oli's systematics skeleton
fixed gitignore files
handle up-down systematics
handle various types of systematics
add covariance matrix calculation
Merge pull request #3 from cmstas/afb-branch

Merging.
Merge branch 'master' of github.com:cmstas/SingleLepton2012

Conflicts:
	.gitignore
	macros/TopAFBLooper/systematics/calculateSystematics.py
	macros/TopAFBLooper/systematics/parseSystematics.py
	macros/TopAFBLooper/systematics/steering.file
add correlation matrix
enforce sign convention for maxdiff type systematics
fix bug in filling  mctaud2_
Merge pull request #4 from linacre/master

Updates to TopAFB code
Merge pull request #5 from linacre/master

Update TopAFB code
Merge remote-tracking branch 'upstream/master'