added setup files to MANIFEST.in for RPM building to work, and updated RPM build instructions (#25)

BUILD.md

@@ -1,7 +1,27 @@
 # Building OnionShare
 
+For GNU/Linux and OSX, get a copy of the source code:
+
+    git clone https://github.com/micahflee/onionshare.git
+    cd onionshare
+
+## Debian-based GNU/Linux
+
+## Red Hat-based GNU/Linux
+
+Install dependencies and build the RPM:
+
+    sudo yum install -y rpm-build python-flask python-stem pywebkitgtk
+    ./build_rpm.sh
+
+The RPM will end up in your dist folder. You can install it like this:
+
+    sudo yum install -y dist/onionshare-*.rpm
+
 ## Mac OS X
 
+*Note: These instructions are a work-in-progress. The OnionShare GUI doesn't yet work in Mac OS X.*
+
 If you don't already have pip installed, install it like this:
 
     sudo easy_install pip