Improvements, fixes and renaming

Special thanks to external contributors

• @andyhaskell / Andrew Haskell from Meta Search
• @cochran-at-niche
• @kujenga / Aaron Taylor from Meta Search
• @sharpner

Fixes

• Fix Client.ListIndexes
• Fix LogRes type
• Fix aroundRadius type
• Fix distinct type
• Fix removeStopWords type
• Fix NewOneWaySynonym method name (minor typo)
• Fix NewAltCorrectionSynonym method name (minor typo)

Additions

• Add Client.SetHTTPClient method
• Add Index.GetObjectsAttrs method
• Add Settings.ToMap method
• Add FileSize field in the IndexRes response type
• Add NumberOfPendingTask field in the IndexRes response type

Changes

• Implement the new Synonym API
• Rename fowardToSlaves parameter into forwardToReplicas
• Rename attributesToIndex setting into searchableAttributes
• Rename numericAttributesToIndex setting into numericAttributesForFiltering
• Allow exactOnSingleWordQuery parameter in queries
• Allow alternativesAsExact parameter in queries
• Allow forwardToReplicas parameter in queries

Misc

• Avoid the inclusion of the syscall package to be used within Google App Engine

Tests

• Add tests
• Run tests in parallel
• Only test across the last 3 major versions of Go (currently 1.5, 1.6 and 1.7)