Build tags

• Added the build tags no_gpl and no_obsolete to disable gpl libraries and obsolete compression type respectively.

What's Changed

• Allow mounting with an offset by @afbjorklund in #34
• Add list option to unsquashfs by @afbjorklund in #35
• Allow disabling lzo and lzma by @afbjorklund in #37

Full Changelog: v1.0.6...v1.1.0