Add valve simulator callbacks
Added valve and sensor id lookups to the hardware configuration
Skeleton of system functions
Add doc strings to System Class
Added reactor lift and lower methods
Added methods to control gripper open, close, up down and gas transfer up, down and transfer
Gas transfer set correct valve id for down
Gripper up and down valve ids swtiched
Add F18 Class
Working digital inputs on system objects, working valves and pnuematic actuator methods, using absolute imports now for all of pyelixys and hal
Merge pull request #1 from henryeherman/devel

Devel into master, with pneumatic axis methods.