Removes macro implementation

[fedefernandez]

This PR fixes #8 by removing the current macro. There are some reasons for that:

• The macro is not compatible with scalameta
• It's using a blocking call here
• It's hard to maintain

@raulraja what do you think? Could you please review? Thanks

[codecov-io]

Codecov Report

Merging #13 into master will decrease coverage by 0.59%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master      #13     +/-   ##
=========================================
- Coverage    84.9%   84.31%   -0.6%     
=========================================
  Files           4        2      -2     
  Lines          53       51      -2     
=========================================
- Hits           45       43      -2     
  Misses          8        8

Impacted Files	Coverage Δ
...in/scala/freestyle/cassandra/api/LowLevelAPI.scala

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update cb7fc45...ca2e16c. Read the comment docs.