added NICAEA source files
Merge branch 'master' into nicaea: updated setup.py
tested errors
skeleton for _nicaea wrapper;
added skeleton for NICAEA bindings
fixed mess with global variables
added specification of cextern in setup.py
skeleton for Nicaea and NicaeaSettings class
instantiation methods for Nicaea
partial implementation of parsing method
first working implementation of power spectrum (single redshift only)
list available settings with possible values
made room for extra arguments to be passed to NICAEA's methods
added Nicaea classes to __init__
update docs
cleaned translation into NICAEA types
translates python strings into NICAEA settings
parse correct redshift distributions and translate into NICAEA friendly ones
added handle to decide on NICAEA bindings installation
C backend computes cross correlations correctly