Fix #41

[ethe]

Fix #41: can not process compound types in struct definition when the IDL is out of order, and other bugs:

• Unnecessary processing already complete type in out-of-order handler.
• Can not process out-of-order definitions in submodules with include.

[codecov]

Codecov Report

Merging #42 into master will increase coverage by 0.05%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #42      +/-   ##
==========================================
+ Coverage   80.46%   80.52%   +0.05%     
==========================================
  Files          35       35              
  Lines        3476     3476              
==========================================
+ Hits         2797     2799       +2     
+ Misses        679      677       -2

Impacted Files	Coverage Δ
thriftpy2/parser/__init__.py	84.52% <100%> (+2.38%)	⬆️

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