v1.0.0

• new extent module implementation (handle unwritten extents correctly)
• xattr support
• journaling transactions & recover support
• improve configurations (with automatic generated config file)
• move stm32disco demo to separate repository
• test suite & tools improvements (more tests on autogenerated images)
• new filesystem tools: lwext4-mkfs, lwext4-mbr
• travis continuous integration
• lot of bugfixes and minor improvements...