Upate build.gradle with repo for material-dialogs.
Upate build.gradle with repo for material-dialogs.

When checking out a clean copy of the repo to begin building I found
that the gradle sync could not complete as it could not resolve
com.afollestad:material-dialogs:0.7.5.2
The website for that library
(https://github.com/afollestad/material-dialogs) indicates that you need
to add the repo to the build.gradle. (After adding it build works
correctly!)

owntracks/android,owntracks/android,owntracks/android