Overhaul continuous integration and docker images

The old CI script was building bayeswave against a LIGO software environment that is no longer updated. This merge:

• Creates a dependency image every night using the latest released versions of LIGO software (e.g., LALSuite). Ensures correct operation in LDG environments.
• Introduces nightly build and operation tests
• Tests the build and operation of every commit to bayeswave in that environment
• Builds and deploys a nightly docker image of BayesWave
• Tests the build of the BayesWave RPM
• Installs BayesWave into its container via the RPM built in CI

.dependencies-el7.Dockerfile

+FROM ligo/base:el7
+
+LABEL name="BayesWave Build Dependencies - EL7" \
+      maintainer="James Alexander Clark <james.clark@ligo.org>" \
+      support="Base image for buillding BayesWave " \
+      date="20190726"
+
+# Yum dependencies
+RUN yum upgrade -y && \
+      yum install -y cmake3 \
+      gcc \
+      gcc-c++ \
+      git \
+      help2man \
+      lalapps \
+      lal-devel \
+      lalframe-devel \
+      lalinference-devel \
+      lalsimulation-devel \
+      python-devel \
+      python-ligo-lw \
+      rpm-build && \
+      yum clean all && \
+      rm -rf /var/cache/yum