added audio jack connectors for emg connections

removed sda scl pullups, removed electrode connectors to make space for proper connectors later

added connectors for electrode inputs and revamped battery connectors

Merge pull request #12 from ThaneGallo/Input-Power-and-Output-Connector-changes Filter abstraction and Input output connectors

Filter abstraction and Input output connectors Abstracted filters so there are 4 signal paths to go to ADC. Added input and output connectors.

Merge pull request #11 from ThaneGallo/merge-fix-2-1 merge fix 2?

merge fix 2

Merge pull request #8 from ThaneGallo/JC-edits Bandpass filter edit and added basic test point coverage

swapped lpf and hpf in bandpass filter and added testpoints on various filter circuits

Merge pull request #7 from ThaneGallo/I2c-addition I2c addition