Revert "added tests and closed outstream,small refactoring"

This reverts commit e8e0bd3cfc1b26d80c39e5ecee789b7aabd70c9d.

Conflicts:
	stratosphere-core/src/main/java/eu/stratosphere/util/NumberSequenceIterator.java
	stratosphere-core/src/test/java/eu/stratosphere/util/SimpleStringUtilsTest.java