V1.0.0 Release Candidate 2

• Enable systemd services by default
• move pid directory to /run/shm
• fix package permissions for /var/lib/robotcontrol
• fix i2c bug in rc_i2c_read_words
• change i2c read length type to 'size_t' other APIs to follow
• new rc_i2c_get_fd function
• various naming updates and documentation polishes