Co-authored-by: Jakob Möller <jakob.moeller@sap.com>

* Certificate Pin Setup

Signed-off-by: d067928 <jakob.moeller@sap.com>

* Introduce OkHttp3Stack.kt

inmemory connection management
diskbased caching (10MB)
Interface Extension based on Volleys BaseHttpStack
Volley Request Queue
Synchronous Calls

Signed-off-by: d067928 <jakob.moeller@sap.com>

* Lint corrections

Signed-off-by: d067928 <jakob.moeller@sap.com>

* Setup Sonar

Signed-off-by: d067928 <jakob.moeller@sap.com>

* Bump Up GradleWrapper

fixes #84

Signed-off-by: d067928 <jakob.moeller@sap.com>

* No Sonar in Circle yet...

Signed-off-by: d067928 <jakob.moeller@sap.com>

* Remove unnecessary execution privilege

Signed-off-by: d067928 <jakob.moeller@sap.com>

Commented out -dontobfuscate

* Release/0.5.5

* Gradle Reset to 0.5.4 (#53)

* Release/0.5.5 (#48)

* Hotfix for resetting Gradle Version (internal pipeline confirmation) (#52)

* Disable minify / shrink

* Dont obfuscate

* Release/0.5.5 (#48)

* Hotfix for resetting Gradle Version (internal pipeline confirmation) (#52)

* Bump up Gradle to 4.0.0 / 6.1.1

* Bump up NDK

* Bump Up SQLite

* adapt circle config