Make install instructions copy pastable

README.rst

@@ -15,16 +15,16 @@ Before installing make sure you have ``pip`` and ``virtualenv``.
 
 Then for a development install::
 
-    $ git clone git@github.com:pikers/piker.git
-    $ cd piker
-    $ virtualenv env
-    $ source ./env/bin/activate
-    (env) $ pip install cython
-    (env) $ pip install -e ./ -r requirements.txt
+    git clone git@github.com:pikers/piker.git
+    cd piker
+    virtualenv env
+    source ./env/bin/activate
+    pip install cython
+    pip install -e ./ -r requirements.txt
 
 To start the real-time watchlist::
 
-    (env) $ piker watch cannabis
+    piker watch cannabis
 
 If you insist on trying to install it (which should work) please do it
 from this GitHub repository::