Merge branch 'master' into dash-lastodash

Author: christopherjeon

apps/dashr-oil-and-gas-ternary/.buildpacks

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+https://github.com/virtualstaticvoid/heroku-buildpack-r#heroku-16

apps/dashr-oil-and-gas-ternary/Aptfile

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+libcurl4-openssl-dev
+libxml2-dev
+libv8-3.14-dev

apps/dashr-oil-and-gas-ternary/Procfile

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+web: R -f /app/apps/"$DASH_APP_NAME"/app.R

apps/dashr-oil-and-gas-ternary/README.md

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+## dashr-oil-gas-ternary
+
+`dashr-oil-gas-ternary` creates a dashboard for mineral composition evaluations from natural gas wells.  
+By pairing a geographic map of well locations with ternary diagram, this app helps geologists to find out results of gas wells with relationship to formations or rock types.
+This is a demo of Dash interactive Python framework developed by [Plotly](https//plot.ly/).
+
+![Animated](assets/Screencast.gif)
+
+## Screenshots
+![initial](assets/Screenshot.png)
+
+## Requirements
+We suggest you to create a separate virtual environment running Python 3 for this app, and install all of the required dependencies there. Run in Terminal/Command Prompt:
+
+```
+git clone https://github.com/plotly/dash-sample-apps.git
+Rscript app.R
+```
+
+## How to use the app
+Run this app locally by:
+```
+RScript app.R
+```
+Open http://127.0.0.1:8050/ in your browser.
+
+Select a subset of data points from the well map, ternary map or bar graph to visualize cross-filtering to other plots.
+Selection can be done by clicking on individual data points, or by using the lasso tool to capture multiple data points or bars. Hold the SHIFT
+key while clicking and dragging for multi-region selection.
+
+## Data source
+Historical shale gas production data for selected Devonian Ohio Shale wells http://www.uky.edu/KGS/emsweb/kyogfaq/kyogfaq10.html