[WIP] Add functions for working with interleaved experiments
- Functions for working with interleaved search results experiments; see ?interleaved for details
- interleaved_preference() calculates the preference statistic from click data according to Eq. 4 from Chapelle et al. (2012) paper on interleaved search evaluation
- C++-based exact_binomial() to estimate sample size for exact binomial tests
- Misc. things changed with this patch:
- ggplot themes theme_min() and theme_facet()
- Documentation updates
- Syntax-checking unit test