v0.3: scheduled release

• replace mustixes with actual phpisms_fixme by following the stack traces by David Snider on 2017-09-08
• Update dependencies by Fred Emmott on 2017-09-07
• Expose TRAVIS_EVENT_TYPE inside docker tests by Fred Emmott on 2017-09-07
• Stub out PHPism and FBLogger by Fred Emmott on 2017-08-25
• Handfix the remaining non-autogenned cases of 'Invalid argument supplied for foreach' by David Snider on 2017-08-25
• Remove lambda argument from C\sum by Kunal Mehta on 2017-08-24
• Math{sum, sum_float} by Kunal Mehta on 2017-08-24
• Remove lambda argument from C\sum_float by Kunal Mehta on 2017-08-24
• Str\capitalize_words should support custom delimiters by Martin Six on 2017-08-23
• Add automated release + documentation system by Fred Emmott on 2017-08-22
• Demote Keyset\slice from the HSL by Kunal Mehta on 2017-08-21
• remove {Vec,Keyset}\keys_with_truthy_values by Fred Emmott on 2017-08-18