Use original CPython repository as the source of CPython `*-dev` versions (#409)

plugins/python-build/share/python-build/2.7-dev

@@ -1,3 +1,3 @@
 #require_gcc
 install_package "readline-6.3" "http://ftpmirror.gnu.org/readline/readline-6.3.tar.gz#56ba6071b9462f980c5a72ab0023893b65ba6debb4eeb475d7a563dc65cafd43" standard --if has_broken_mac_readline
-install_hg "Python-2.7-dev" "https://bitbucket.org/mirror/cpython" "2.7" standard verify_py27 ensurepip
+install_hg "Python-2.7-dev" "https://hg.python.org/cpython" "2.7" standard verify_py27 ensurepip

plugins/python-build/share/python-build/3.2-dev

@@ -1,3 +1,3 @@
 #require_gcc
 install_package "readline-6.3" "http://ftpmirror.gnu.org/readline/readline-6.3.tar.gz#56ba6071b9462f980c5a72ab0023893b65ba6debb4eeb475d7a563dc65cafd43" standard --if has_broken_mac_readline
-install_hg "Python-3.2-dev" "https://bitbucket.org/mirror/cpython" "3.2" standard verify_py32 ensurepip
+install_hg "Python-3.2-dev" "https://hg.python.org/cpython" "3.2" standard verify_py32 ensurepip

plugins/python-build/share/python-build/3.3-dev

@@ -1,3 +1,3 @@
 #require_gcc
 install_package "readline-6.3" "http://ftpmirror.gnu.org/readline/readline-6.3.tar.gz#56ba6071b9462f980c5a72ab0023893b65ba6debb4eeb475d7a563dc65cafd43" standard --if has_broken_mac_readline
-install_hg "Python-3.3-dev" "https://bitbucket.org/mirror/cpython" "3.3" standard verify_py33 ensurepip
+install_hg "Python-3.3-dev" "https://hg.python.org/cpython" "3.3" standard verify_py33 ensurepip

plugins/python-build/share/python-build/3.4-dev

@@ -1,3 +1,3 @@
 #require_gcc
 install_package "readline-6.3" "http://ftpmirror.gnu.org/readline/readline-6.3.tar.gz#56ba6071b9462f980c5a72ab0023893b65ba6debb4eeb475d7a563dc65cafd43" standard --if has_broken_mac_readline
-install_hg "Python-3.4-dev" "https://bitbucket.org/mirror/cpython" "3.4" standard verify_py34 ensurepip
+install_hg "Python-3.4-dev" "https://hg.python.org/cpython" "3.4" standard verify_py34 ensurepip