XCode: Small project settings upgrade
Merge branch 'master' of https://github.com/G-Node/pandora into grewe
[CI/travis]: Add OSX support
[CI/travis] set lang. to objective-c as per doc
[CI/travis] add linux version too
[CI/travis] explicitly select serial-dev for hdf5
[CI/travis] forgot to add make before ctest. Doh.
[CI/travis] install gcc-4.8 from ppa for C++11 support
[CI/travis] *actually* install g++ 4.8 not only gcc 4.8 *sigh*

I thought it was GNU compiler *collection* ;-)
[CI/travis] Do testing in after_success

Because building != testing
README.md: add build status
Charon: Unify ValueBox template and its const-spezialisation
Charon: ValueBox: Don't inherit from TypeSpec
Charon: DataBox: remove unnecessary template parameter
Charon: const correctly even more
DataBox: Use enable_if to distinguish between const an !const
CMake: Initial adaptions for windows
[Win] File: replace static const with defines for VERSION, FORMAT
[win] Use "using" to avoid typename outside templates

Because vsc++13 doesn't like it
[win] include <cpp/H5Cpp.h> instead of <H5Cpp.h>