Update README.md

Update compile sdk to 25

Update sdk version to 25

Update travis because of upgrading bulid tools

Update gradle version to 2.3

use oraclejdk8 to compile for travis-ci

Update gradle to 2.2.0

Fix the wrong network path

update readme

Add permission request for M, and add travis

Merge pull request #9 from DevFactory/release/fields-should-not-be-initialized-to-default-values-fix-1

Merge pull request #13 from DevFactory/release/multiple-quality-improvements-fix-1

Merge pull request #12 from DevFactory/release/utility-classes-should-not-have-public-constructors-fix-1

Multiple quality improvements

squid:S1118 - Utility classes should not have public constructors