use Builder pattern to build WroManager
remove default constructor for WroManager
create SimpleWroManagerFactory & fix compiling issues. Still there are several failing unit tests.
Merge branch '1.6.x' into issue628
fix failing unit test
fix one more test
fix one more test
fix failing tests in TestConfigurableWroManagerFactory
fix failing test
fix failing test in TestWro4jMojo
Merge branch '1.6.x' into issue628
use logback library & improve TypeScriptCompiler error log
Merge remote-tracking branch 'origin/issue628' into issue628
Merge branch 'issue628' into 1.6.x