Minor fixes

Feature:

• Add cover_factor to compute_bops to control the coverage range covered by activation bitwidth w/o overflow
  API changes:
• Rename ExactBOPs to CalibratedBOPs
• bops_reg_factor is now beta
  Fix:
• AvgPool2D was doing max pool
• This and that

v0.1.0

Initial release, bugs falling from the sky.