parse Java in parallel threads

See #74, release log:

• a0ad934 by @yegor256: #74 show time
• fc3736a by @yegor256: Merge pull request #72 from ye...
• ffefd9d by @yegor256: new version in README
• b73a1c5 by @yegor256: #74 10m timeout for metric
• f9f8882 by @yegor256: #74 time fixed
• 57aef29 by @yegor256: #74 time fixed
• ffdae8b by @yegor256: #74 authors moved out
• 1835f0e by @yegor256: #74 recursion fix
• 71c3ff6 by @yegor256: #74 time fixed
• 2376c12 by @yegor256: #74 mkdir
• bfba4e5 by @yegor256: #74 ping
• 5d5d828 by @yegor256: #74 typo
• 6c1d5a3 by @yegor256: #74 typo
• f8bb866 by @yegor256: #74 quicker docker build
• e88e4dd by @yegor256: #74 no authors
• 7382960 by @yegor256: #74 more tests
• ac9118a by @yegor256: #74 cleaned up
• cf2d4da by @yegor256: #74 more tests
• 85070b2 by @yegor256: #74 more tests
• 4d06473 by @yegor256: #74 delete broken syntax too
• and 30 more...

Released by Rultor 2.0-SNAPSHOT, see build log