Use -std=c++11
Update CSVReader class and its testcase to use some C++11 features.
Convert tabs -> spaces in include/storm/*.hpp
Convert tabs -> spaces in testcases.
Remove fixed_int.hpp: C++11 has <stdint> for fixed-size integers
Update matrix.hpp to use some C++11 features.
Change noncopyable class to use "= delete"
Add test of noncopyable class; this test is expected to fail to compile.
Update pairwise_iterator.hpp to use C++11 features.

The only change so far is to condense > > to >> at the end of a
template.
Update string.hpp to use some C++11 features.

The decision was made to leave string_to() and string_from() since the
C++11 to_string() and sto* functions are less general than these.
Update csvreader test to use C++11 features.
Update cyclic_iterator test to use C++11 features
Merge pull request #1 from ajbennieston/c++11

Update code to use C++11 features where appropriate