adding hw2 key
Merge branch 'master' of https://github.com/ga-students/DAT_SF_10
Added lab7 on PCA
Merge branch 'master' of https://github.com/ga-students/DAT_SF_10
Updated syllabus
Updated lec6, added lec7 and papers
Merge branch 'master' of https://github.com/ga-students/DAT_SF_10
added to lab6/hw 3