[NEW] Add CircleCI 2 (#57)

.circleci/config.yml

android/app/BUCK

android/app/build.gradle

android/app/src/main/AndroidManifest.xml

android/app/src/main/java/com/rocketchatrn/MainActivity.java

...d/app/src/main/java/com/rocketchatrn/MainApplication.java

...ode_modules_reactnavigation_src_views_assets_backicon.png

android/app/src/main/res/drawable-mdpi/app_images_logo.png

...ode_modules_reactnavigation_src_views_assets_backicon.png

...ode_modules_reactnavigation_src_views_assets_backicon.png

...ode_modules_reactnavigation_src_views_assets_backicon.png

...ode_modules_reactnavigation_src_views_assets_backicon.png

app/lib/createStore.js

index.android.js

index.ios.js

ios/RocketChatRN.xcodeproj/project.pbxproj

...odeproj/xcshareddata/xcschemes/RocketChatRN-tvOS.xcscheme

...RN.xcodeproj/xcshareddata/xcschemes/RocketChatRN.xcscheme

...etChatRN/Images.xcassets/AppIcon.appiconset/Contents.json

ios/RocketChatRN/Info.plist