Make tf/idf methods customizable in TfidfModel
Revert "Make tf/idf methods customizable in TfidfModel"

This reverts commit 680ed0ed7a06ddcf40d56d7a00c70e57380b46e2.
make normalize_tfidf, normalize_tf, log_base and add term separately configurable
make tfidf more flexible, accepting arbitrary fncs
updated ssh server for doc upload
pyro daemon wrapper supports explicit ip and port
* and falls back get_my_ip() and random port if not provided (old behaviour)
allow retrieving vectors from index, given their position in index
Merge branch 'develop' into optindex
Merge branch 'optindex' into develop
Merge pull request #81 from piskvorky/optindex

Optindex
added no-op context manager
* that can be used instead of lock, so that `with lock_object: ...` works without change
logentropy raises exception when called with `corpus=generator`
doc update: remind users they need to enable logging for `lsi.print_topics()`
Improve wikimedia markup filtering.
Merge pull request #83 from aweinstein/develop

Improve wikimedia markup filtering.
added method for "hardlink-copying" a dir
* used in simserver
Merge branch 'develop' of github.com:piskvorky/gensim into develop
use multiprocessing to parallelize index queries
git ignore .bak and .npy files
use multiprocessing.imap instead of map