Add progressive mode

[FlorentD]

No description provided.

[codecov-io]

Current coverage is 55.12%

Merging #5 into master will increase coverage by +6.30% as of eb2d4e2

@@            master      #5   diff @@
======================================
  Files            8       8       
  Stmts          297     312    +15
  Branches        44      46     +2
  Methods          0       0       
======================================
+ Hit            145     172    +27
- Partial          5       6     +1
+ Missed         147     134    -13

Review entire Coverage Diff as of eb2d4e2

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