added lab7 version 2 with KNN example using PCA
Merge branch 'master' of https://github.com/ga-students/DAT_SF_10
added lab8 on kmeans clusters
Merge branch 'master' of https://github.com/ga-students/DAT_SF_10
Lec 8
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adding hw3 key
added solutions for lab8
Merge branch 'master' of https://github.com/ga-students/DAT_SF_10
fixed error in lab 8 solutions
resolving name conflicts
Merge branch 'master' of https://github.com/ga-students/DAT_SF_10
HW4
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add lab9
Merge branch 'master' of https://github.com/ga-students/DAT_SF_10
lec 9
syllabus to Misc
Merge branch 'master' of https://github.com/ga-students/DAT_SF_10