RFR: 8273655: content-types.properties files are missing some common types

[Julia Boes]

This change adds some common types to the content-type.properties files, notably .js, .css, and .jar, as well as some others. 

The duplicated entry for .zip is removed from the Windows properties file.

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Commit messages:
 - add basic test
 - initial change

Changes: https://git.openjdk.java.net/jdk/pull/5506/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5506&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8273655
  Stats: 171 lines in 3 files changed: 155 ins; 0 del; 16 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5506.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5506/head:pull/5506

PR: https://git.openjdk.java.net/jdk/pull/5506