RFR: added handling of zips, implants

[Alexandre Iline]

Instr updated to handle zips and implants with the plugin

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Commit messages:
 - added handling of zips, implants

Changes: https://git.openjdk.org/jcov/pull/34/files
 Webrev: https://webrevs.openjdk.org/?repo=jcov&pr=34&range=00
  Stats: 263 lines in 4 files changed: 229 ins; 4 del; 30 mod
  Patch: https://git.openjdk.org/jcov/pull/34.diff
  Fetch: git fetch https://git.openjdk.org/jcov pull/34/head:pull/34

PR: https://git.openjdk.org/jcov/pull/34