Merge pull request #652 from nelenkov/dev

open redirection URL in browser if not dev console
Merge pull request #657 from nelenkov/dev

renamed PreferenceActivity to AndlytisPreferenceActivity, fixes #654
Merge pull request #658 from nelenkov/dev

updated changelog for ALPHA2; don't show changelog on first install
Merge pull request #659 from nelenkov/dev

Fixed account-specific preferences
Timezone is no longer available in revenue response
Merge pull request #661 from willlunniss/api_fix

Timezone is no longer available in revenue response
Update gradle, android gradle plugin and build tools
Merge pull request #662 from willlunniss/dev

Update gradle, android gradle plugin and build tools
bumped to 2.7.0