fixing queries in q6
adding homework for chapters 8 and 9
adding chapter 10 homework
adding optional exercises to chapter 10
adding homework for chapters 11 and 12
fixing typo
adding a bit more to the questions
fixing typo
adding an mwb version of Diagram 4.11
adding diagram 4.11 in dia format, which appears to be what the author used
removing mwb format.  It would be too confusing at this point.
updating to let folks know not to use MySQL Workbench for E/R diagrams
Merge pull request #141 from pmeth/master

Dia format ER diagram
Merge remote-tracking branch 'upstream/master'

Conflicts:
	02Installing/homework.txt
	04ModelDesign/exercises.txt
	07AdvancedQuerying/exercises.txt