override drawRegion to do renderRegion's work itself
override Math.min
Add test for ResourceInputStream and InputStreamReader
Add utf8.txt to the jar
Update number of passing tests
cache fields
Merge branch 'master' into optimize-drawRegion
Merge pull request #340 from marco-c/test_inputstreamreader

Test InputStreamReader and ResourceInputStream
add basic Graphics.drawRegion test
Merge pull request #341 from mykmelez/optimize-stuff

optimize Graphics.drawRegion, Image.class.getField, Math.min