Correctly handle nested types when java_multiple_files=true

[rmichela]

Fixes #98

[codecov]

Codecov Report

Merging #100 into master will increase coverage by 19%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             master     #100    +/-   ##
==========================================
+ Coverage     61.21%   80.22%   +19%     
+ Complexity      240      239     -1     
==========================================
  Files            40       34     -6     
  Lines          1052      799   -253     
  Branches        112       82    -30     
==========================================
- Hits            644      641     -3     
+ Misses          384      134   -250     
  Partials         24       24

Impacted Files	Coverage Δ	Complexity Δ
...main/java/com/salesforce/jprotoc/ProtocPlugin.java
...ava/com/salesforce/jprotoc/GeneratorException.java
...ava/com/salesforce/jprotoc/dump/DumpGenerator.java
...rc/main/java/com/salesforce/jprotoc/Generator.java
...ava/com/salesforce/jprotoc/jdk8/Jdk8Generator.java

---

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 7ccb0b7...83ba34f. Read the comment docs.