mashr version v0.2-11 (alpha)

Major changes include:

1. Incorporating Extreme Deconvolution code as part of mashr package.
2. Linear transformation for posterior (for common baseline application) and a C++ implementation of it.
3. A method to estimate null correlation; and consequently changes to the original estimate_null_correlation function.
4. Function mash_update_data to update mash data (for common baseline, and for re-estimated V).
5. Sampling from posterior (R implementation only) and estimate of sharing based on posterior samples.
6. mixsqp is now required.