Hacking Session, Day 1

Stuff worked on during the hacking session on day 1:

• cal@: Fix maintainer timeout handling in pull request bot due to a query being sent to the wrong database
  [515a0640ec06a68ff73221503556d60f55e8128d/mpbot-github]
• l2dy@: Fix a couple of corner cases in maintainer detection for Portfiles in pull request bot
  [09f640ceb50e730a9ccbfb91e71ecc726a15036e/mpbot-github]
• l2dy@: Enable maintainer timeout handling on openmaintainer ports in pull request bot
  [7805a25a28249468effdd43bc0dab365324bd9c0/mpbot-github]
• l2dy@: Add macOS 10.13 to the Travis CI build matrix, build the MacPorts package required and work around a bug in bintray deployment in Travis
  [d1116566a8998c4ebaf07a5724fd7798c69f9103/macports-ports]
  [e8447960aad1ef6b97ce910e642cf79cc969aa04/macports-base]
  [68eb49981864b4d470c6d37ca632f454a1ead35b/macports-base]
  ​https://github.com/travis-ci/travis-ci/issues/9314
• cal@: Improve documentation of mpbb
  [6dd94d367b768580071e75ebc4a3d8911e1ad517/mpbb]
  [f64c0dacaff29b6561262032eec3d116b0ee8802/mpbb]
• umeshksingla@: Fix a crash in variant handling in port migrate
  [272ae31859ae566fb3ee6372431c76396e171437/macports-base]
• raimue@: Push build status to commit log on GitHub to make it easier to find builds for a certain commit
  [ff18166be63a5a6ad7b67be82c4b06c2a281da88/macports-infrastructure]
  [d9aeeb32b22a06eb39f1a0317869e9c12e3ed021/macports-infrastructure]
• raimue@: Remove misleading patchfile naming examples from the guide
  [8690d0f287f8c03d51404147dac6d54503a401c2/macports-guide]
• raimue@: sip_copy_proc: Avoid COPYFILE_CLONE, #55575
  [995dde8476c48580db4f6eedfde09e90dc5e8c99/macports-base]