Create MCP4xxx.js
Update MCP4xxx.js

Correct module name and fix connect() arguments.
Create MCP4xxx.md
Update MCP4xxx.js

Pots should be zero-indexed everywhere, not just in some places.
Update MCP4xxx.md

Added applications section and added a few other notes.
Fix issue with BMP085.js in 32-bit int's. 

Also packed the code in a little tighter in the ugly calculations section. More can still be done there, but this should save a few memory units
Rename MCP4xxx.js to MCP4xxxI2C.js

There will be an MCP4xxxSPI module soon. 

MCP 44xx, 45xx, 46xx are I2C, MCP41xx, 42xx, 43xx are SPI
Rename MCP4xxx.md to MCP4xxxI2C.md

See desc for other rename commit
Update MCP4xxxI2C.js

Oops, left a debug logging statement in there
Update MCP4xxxI2C.js

another debug statement removed
Update MCP4xxxI2C.js

Account for changed name of module
Update MCP4xxxI2C.md

Account for changed name of module in example code
Merge pull request #86 from SpenceKonde/master

MCP4xxx I2C digipot modules