Buffer Size adjustments for EMCO

Adds the following constraints to EMCO:

• bufferSize
  • how many lines to hold in the buffer. Defaults to 100000
• deleteLines
  • when the buffer does fill up, how many lines to delete? Defaults to 1000.

Also adds EMCO:setBufferSize(bufferSize, deleteLines) to adjust these values after creating the EMCO.

Also resolves #9