Added TransparentAppGuideActivity as a first try to teach users how to use the App. Needs to try also the 1 minute guided demo like mailbox app does
Merge branch 'hotfix/2.15.13' into develop

* hotfix/2.15.13:
  Added comment to circle ci config
  Added null exception check
  Preparing for release of 2.15.13
  Incremented buildToolsVersion to 20.0.0
  Switched platform-tools with tools dependencies order
  Update .travis.yml
  Update circle.yml
  Added latest version of build-tools
  Update .travis.yml
  Create .travis.yml
  Fixed for latest Android SDK updates Updated APL version and released on Maven
  Fixed full changelog dialog
Merge branch 'hotfix/2.15.13' into develop

* hotfix/2.15.13:
  Disabled mail notification for travis builds
  Trying to fix travis ci script
Merge branch 'hotfix/2.15.13' into develop
Merge branch 'hotfix/2.15.14' into develop
Created hot fix version 2.15.15
Improved proxy ping
Improved exception reporting, adding also objects to JSON functionality
Cleaned up TAG creations
Improved exception logging
Added JSONException, without reporting the error. It's a common error to receive wrong answers due to the proxy servers between the request and the geoIP services
Merge branch 'hotfix/2.15.15' into develop

Conflicts:
	proxy-settings/src/main/java/com/lechucksoftware/proxy/proxysettings/utils/startup/StartupAction.java
Changed APL API in order to return only Proxy standard class instead of too complicated ProxyConfiguration class
Merged AccessPoint class with ProxyConfiguration class
Cleaning up APL after ProxyConfiguration and AccessPoint merge
Added build number and simple footer for Wi-Fi access points list
Disabled crashlytics for CI
Disabled crashlytics for CI
Cleaning up APL and Proxy Settings
Added a default application theme. Cleaned up themes resources. Added some refinements to the UI
Working on performance. Needs to try to persist the Wi-Fi ap on internal DB in order to avoid unnecessary operations