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Updated links to match new repository location.

• Adds modelsim_vcom_flags and modelsim_vlog_flags compile options #97

Fixed bug in codecs for integer_vectors with min value elements. Fixed bug in parsing of the used_packages argument to the generate_codecs function.

• Makes add_source_file(s) methods raise exception when no files matched.

• Adds ghdl_flags compile and simulation option.

• Adds dependency scanning of package instantiations.

• Fixes issue #90. Conflict with parallel invocation of GHDL using GCC backend.

Added workaround to make Riviera-PRO 2015.10 pass all test cases.

• Added find function to string_ops for finding first substring/character of a string.

• Added workaround to support GHDL 0.33
• Fixed broken test cases for OSVVM integration example