Removed more references to hg:

doc/internal/hg_primer.txt

-.. _hg_primer:
-
-================
-hg in a Nutshell
-================
-
-Deleted. We're not using hg anymore, we switched to git.

doc/internal/how_to_release.txt

@@ -51,9 +51,9 @@ You will need to commit the previous changes, tag the resulting version, and
 push that into the original repository. The syntax is something like the
 following::
 
-    hg commit -m"modifications for 0.X release" setup.py doc/conf.py NEWS.txt HISTORY.txt theano/configdefaults.py doc/library/config.txt
-    hg tag 0.X
-    hg push
+    git commit -m "Modifications for 0.X.Y release" setup.py doc/conf.py NEWS.txt HISTORY.txt theano/configdefaults.py doc/library/config.txt
+    git tag -a rel-0.X.Y
+    git push
 
 The documentation will be automatically regenerated in the next few hours.
 

doc/internal/index.txt

@@ -17,5 +17,4 @@ If you're feeling ambitious, go fix some `pylint
    mammouth
    metadocumentation
    python
-   hg_primer
    how_to_release

doc/internal/metadocumentation.txt

@@ -134,7 +134,7 @@ be logged into ``ceylon``, Fred leaves a shell open for that.)
 
 The cronjob executes the scripts
 ``~/nightly_build/do_nightly_build_{theano,pylearn,deeplearning}``.
-These scripts perform an "hg pull -u" of theano (and pylearn, and
+These scripts perform an update of theano (and pylearn, and
 DeepLearningTutorials too), and execute nosetests (in various settings).
 
 The output is emailed automatically to the `theano-buildbot`_ mailing list.

doc/library/index.txt

@@ -46,12 +46,3 @@ There are also some top-level imports that you might find more convenient:
 
     Works like :func:`tensor.dot` for both sparse and dense matrix products
 
-
-.. function:: __src_version__()
-
-    Returns the mercurial (hg) identifier of the current tip.  
-    
-    If there are uncommitted modifications, this function raises an Exception.
-    If the theano package is not under mercurial control, then again this function
-    raises an Exception.
-