0.5.0 - Custom assert functions and interactive tree results

What's Changed

• Add a way to write custom assert functions by @elgopher in #32
• Add collapsing/expanding of tree nodes by @elgopher in #29
• Optimize performance of results tree by @elgopher in #23
• Fix handling nil values in assertions by @elgopher in #24
• Change "Running" message to ">" in test output by @elgopher in #27
• [bugfix] "]" character is escaped in assert_eq/assert_not_eq arguments by @elgopher in #30
• Remove assert_same and assert_not_same by @elgopher in #31

Full Changelog: 0.4.0...0.5.0

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