switched build from Maven to Gradle.
deleted Maven's pom.xml file. use Gradle script instead.
removed some outdated comment.
random safe cleanup suggested by IDEA
fixed a bug in equals() in CustomField.java

it did not properly compare values list.
added tests.
reformat compile dependencies in build.gradle
Merge branch 'ask-random-cleanup'
Update README.md
Merge pull request #96 from taskadapter/ask-custom-equals

#95 fixed a bug in equals() in CustomField.java
update Redmine test data (new Redmine 2.3.3 installation)
minor safe cleanup
added .gitignore
Merge remote-tracking branch 'upstream/master'

Conflicts:
	.gitignore
	pom.xml
	src/test/resources/api_test.properties