4.2a5

Major changes since 4.2a4

• inference module in wrapper
• moved SfmData classes from dataset.* to sfm folder
• lots of plotting/html/wrapping support for roboticsbook.org

Detailed PR list

• Added inference module by @dellaert in #1068
• Added support for positioning in BayesNet plotting by @dellaert in #1070
• Wrap FindKarcherMean for Rot3 by @johnwlambert in #1069
• Wrapped more things by @dellaert in #1077
• Moved Sfm classes to their own files by @dellaert in #1078
• Expose some iSAM2/FixedLagSmoothing functionality for the bindings by @senselessDev in #1053
• Cleaned up loading SfmData by @dellaert in #1082
• Fixes to get matlab wrapper working properly by @varunagrawal in #1083
• Wrapper Update by @varunagrawal in #1084
• Add default constructor to PoseRotationPrior to fix serialization by @ScottMcMichael in #1086
• Add shared_ptr definition for remainder of camera objects by @dwisth in #1088
• Fix DotWriter wrapping by @dellaert in #1089
• Improvements in linear by @dellaert in #1091
• Frobenius Factor Eigen Fix by @varunagrawal in #1096
• New functionality in linear by @dellaert in #1095