clang-format: check for GNU sed on OS X
Merge pull request #107 from toxeus/gnuSed

clang-format: check for GNU sed on OS X
cppcheck: fix stlSize
Merge pull request #108 from toxeus/fixStlSize

cppcheck: fix stlSize
Cleanup of OTAmount and removed unnecessary cpp file.
Cleanup of OTSignature and OTSignatureMetadata.
Naming convention and structure cleanup of OTSignatureMetadata.
Some cleanup of OTStringXML.
Cleanup of OTAssert.
Cleanup of structure and naming of OTAcctList.
Naming and structure cleanup of OTSubkey.
Removed unused HelloWorld stuff.
Merge pull request #112 from murrekatt/develop

Some initial structure and naming cleanup of easy targets
CMake: remove -Wno-unused-result from CXXFLAGS