Update README.md

Added Android distinction
Add AChartEngine and Jackson libraries
Bunch of changes on models and charts
Merge remote-tracking branch 'origin/master' into new-libraries

Conflicts:
	src/org/missionassetfund/apps/android/models/Transaction.java
Merge pull request #128 from CodePath-MAF/new-libraries

Add AChartEngine and Jackson libraries
Merge branch 'master' into revamp-dashboard