Updated Windows setup JDK images to JDK8
Change height exercise to centimeters instead of meters.
Merge remote-tracking branch 'upstream/master'
Remove unnecessary material from README
Move intro material suggestions to separate file.
Merge pull request #63 from bridgethillyer/master

Updated Windows setup JDK images to JDK8
Fixed image link
WIP improving module 4
Added more to module 4
Module 4 DONE like a BOSS
Started improving module 5