Package MDA not available in advanced_functionality/r_bring_your_own/Dockerfile

When running the sample notebook, the image build is throwing this message, that will lead to the failure of the training job later.

Warning messages:
```1: package 'mda' is not available (for R version 3.2.3)
2: In install.packages(c("mda", "plumber"), repos = "https://cloud.r-project.org") :
installation of package 'curl' had non-zero exit status
3: In install.packages(c("mda", "plumber"), repos = "https://cloud.r-project.org") :
installation of package 'sodium' had non-zero exit status
4: In install.packages(c("mda", "plumber"), repos = "https://cloud.r-project.org") :
installation of package 'webutils' had non-zero exit status
5: In install.packages(c("mda", "plumber"), repos = "https://cloud.r-project.org") :
installation of package 'plumber' had non-zero exit status
```
Error message from the training job CW logs :
```Error in library(mda) : there is no package called 'mda'```

Start with advanced_functionality/r_bring_your_own/Dockerfile and reproduce the sample notebook image build using the reported R 3.2.3 environment. Check the installation failures for mda and its listed dependencies, then verify that the image can load mda and the training job no longer reports the missing package.

Written by the indexing model from the issue text.