lkairies-hadoop-append/contrib: Implemented append method in XtreemFSHadoopClient.
lkairies-hadoop-append/contrib: Changed Implementation of append methoed regarding code review (39e9f306270f).
servers: Fixed Nullpointer exception in setSysAttr.
Occured if replication policy is none and default striping policy will be set.
Merge branch 'lkairies-hadoop-append'

Conflicts:
	contrib/hadoop/src/org/xtreemfs/common/clients/hadoop/XtreemFSFileSystem.java
try to fix generate_initd_scripts.sh for SLE11, CentOS5 and RHEL5
enforce error-free generation of init.d scripts

(exit if any command exists with a non-zero status)
servers: removed unused contructor from BenchmarkFailedException to retrieve Java 6 compatibility
Create README.md
Update README.md
Update README.md
client: skip immutable attributes in fuse_adapter to avoid errors while copying files on OS X (Issue #312)
tests: Add TRAVIS CI

Add TRAVIS CI config (.travis.yml) and script (contrib/unit_tests.sh) for
executing cpp and java unit tests.
tests: removed C++ unittests (temporarily) from Travis-CI
client: eliminated compiler warning
Added check for clang compiler to Makefile
Merge branch 'master' into ckleineweber-tracing