Get the master branch to work on Particle WebIDE

[jersey99]

Currently there is a thread open here at: https://community.particle.io/t/undefined-reference-error-linker-error-when-compiling-from-web-ide/15890

Flattening the directory structure isn't enough to get the webIDE to link correctly at particle.io/build.

[jersey99]

This has been because '*.c' files were not being imported in the particle.io WebIDE! They have now fixed the issue.