Improvements to build.py:

- Now uses Python argparse for cleaner handling of arguments
- Added function documentation
- Removed a few unneeded functions
- Updated nightly logic to incremement minor version
- Added support for building from specific branch or commit
- Changed --no-stash option to --no-uncommitted for clarity
- Added a --release flag, default package output will now contain the branch and commit hash in the version number
- Static builds are now listed as an architecture
- Changed default upload bucket to dl.influxdata.com/telegraf
- Don't include iteration in package name

closes #1040

scripts/circle-test.sh

@@ -75,8 +75,9 @@ if [ $? -eq 0 ]; then
     unset GOGC
     tag=$(git describe --exact-match HEAD)
     echo $tag
-    exit_if_fail ./scripts/build.py --package --version=$tag --platform=linux --arch=all --upload
-    exit_if_fail ./scripts/build.py --package --version=$tag --platform=windows --arch=all --upload
-    exit_if_fail ./scripts/build.py --package --version=$tag --platform=freebsd --arch=all --upload
+    exit_if_fail ./scripts/build.py --release --package --version=$tag --platform=all --arch=all --upload --bucket=dl.influxdata.com/telegraf/releases
     mv build $CIRCLE_ARTIFACTS
+else
+    # Upload Linux build artifact to S3
+    ./scripts/build.py --package --upload
 fi