Improve the Travis CI build

It now tests both the Java projects and the Jupyter notebooks.

This is a first cut at addressing #53.

.travis.yml

@@ -1,9 +1,19 @@
-language: java
+language:
+  - java
+  - python
 jdk: oraclejdk8
+python:
+  - "3.5"
 branches:
-  only: master
-install: true
+  only:
+  - master
+  - "/.*-[0-9]+\\..*/"
+install: ".travis/install.sh"
 script: ".travis/build.sh"
+cache:
+  directories:
+  - "~/.m2/repository"
+  - "~/miniconda"
 env:
   global:
   - secure: bM/ROC4gfw5dwe7hvcpdFTNBRx51wIvQ+atUPhf9jZjBRidI5Wr0Rhsc30HUAF0sWh4tw2qkCjPAioC/84jp2tVqUXM0PqiElLunVdf6ooJ09uBkTr3nUTdSWflEpKqrI4DPfBS317Xoj26GdWu6YaPLlpQDIPMgdMjZG9fUJRE=

.travis/build.sh

@@ -1,12 +1,3 @@
 #!/bin/sh
-dir=$(cd "$(dirname "$0")" && pwd)
-if [ "$TRAVIS_SECURE_ENV_VARS" = true \
-  -a "$TRAVIS_PULL_REQUEST" = false \
-  -a "$TRAVIS_BRANCH" = master ]
-then
-  cd maven-projects &&
-  mvn -Pdeploy-to-imagej deploy --settings "$dir/settings.xml"
-else
-  cd maven-projects &&
-  mvn install
-fi
+curl -fsLO https://raw.githubusercontent.com/scijava/scijava-scripts/master/travis-build.sh
+sh travis-build.sh $encrypted_4bf550f17d15_key $encrypted_4bf550f17d15_iv

.travis/install.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+CONDA_DIR=$HOME/miniconda
+if [ ! -d "$CONDA_DIR" ]; then
+  if [ "$TRAVIS_PYTHON_VERSION" = "2.7" ]; then
+    wget https://repo.continuum.io/miniconda/Miniconda2-latest-Linux-x86_64.sh -O miniconda.sh
+  else
+    wget https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh -O miniconda.sh
+  fi
+  bash miniconda.sh -b -p "$CONDA_DIR"
+fi
+export PATH="$CONDA_DIR/bin:$PATH"
+hash -r
+conda config --set always_yes yes --set changeps1 no
+conda update -q conda
+conda info -a
+conda env create -n test-environment python="$TRAVIS_PYTHON_VERSION" -f environment.yml
+source activate test-environment