Drawer, Toolbar and minor UI optimizations (#145)

* initial add of toolbar and hamburger menu to main activity
* toolbar added to preferences and accounts screens
* fixed original string (name)
* Layout fix for content
* initial add of toolbar and hamburger menu to main activity
* remove unnecessary padding bottom
* fix styling and paint login activity in blue
* toolbar added to preferences and accounts screens
* Layout fix for content
* remove unnecessary padding bottom
* fix styling and paint login activity in blue
* fixes after rebase
* consolidate style since minVersion=16, make drawer to be behind the systembar
* optimize drawer header
* add back navigation to login activity, fix spinner background
* add back navigation
* more launcher icon to mipmap folders
* fix identation
* fix license header
* revert code style deletion, change identation
* proper notification icon
* proper resolution for login logo
* fix large notification icon
* removed unused Eclair switch since support is v16+
* only use small notification icon
* spaces->tabs
* fix toolbar style for Android 4.x