Add GrepConfigBuilder in order to GrepConfig make testable.
Add GrepConfigBuilder in order to GrepConfig make testable.
Add tests for GrepConfigBuilder
Merge branch 'feature-application-refactor' of github.com:tri-star/tigrep into feature-application-refactor

Conflicts:
	src/grep_config_builder.h
	src/tests/grep_config_builder_test.cc
Merge pull request #8 from tri-star/feature-application-refactor

Feature application refactor