Also fix WebInterfaceServer.java to properly check whether path
is absolute on Windows.

Default directory entries in nephele-user.xml and pact-user.xml
are now commented out because java code will load proper default.

Allows deploying Ozone to a local repository next to a vanilla Stratosphere distribution.

Iteration head tasks are not merged with first operator in superstep, if there is a local strategy that needs to be executed directly prior to the first superstep.

Travis-CI configuration

Separated classpaths for cluster and clients.

Split pact-compiler project between compiler and its unit tests and the compiler end-to-end tests with example programs.

Update pom.xml

The configured dependency version for pact-array-datamodel should be the same as the one of the enclosing project.