Reverting the singleton of AllAssetsSummary
Creating the validation to do not sell more stocks than have.
Merge branch 'master' of https://github.com/lgsanjos/RendimentosFinanceirosApp

Conflicts:
	app/src/br/com/meusativos/allassets/model/AllAssetsSummary.java
Merge branch 'master' of https://github.com/lgsanjos/RendimentosFinanceirosApp
Cant sell more trades than you have.
Reorganize imports.