remove unused aws-related files

[maikia]

Removed the old AWS-related files (as suggested in #475 (comment))

[codecov]

Codecov Report

Merging #481 (c906744) into master (a2f585f) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #481      +/-   ##
==========================================
- Coverage   93.56%   93.54%   -0.02%     
==========================================
  Files          99       99              
  Lines        8496     8496              
==========================================
- Hits         7949     7948       -1     
- Misses        547      548       +1     

Impacted Files	Coverage Δ
ramp-engine/ramp_engine/base.py	92.30% <0.00%> (-1.29%)	⬇️

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[lgtm-com]

This pull request fixes 2 alerts when merging c906744 into a2f585f - view on LGTM.com

fixed alerts:

• 1 for Module is imported with 'import' and 'import from'
• 1 for Wrong number of arguments in a call

[agramfort]

thx @maikia