CI fixes

This enables Linux testing on Appveyor, fixes .NET installation on
Travis and adds the ability to test on multiple Python versions
(although 3.7 testing is not enabled yet).

Fixes: #169
Issue: #166

Author: elprans

.ci/appveyor_find_python.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+for d in $(ls -d /home/appveyor/venv${PYTHON_VERSION}*/bin/ | sort -nr); do
+    echo "${d}"
+    exit 0
+done
+
+echo "Could not find Python version ${PYTHON_VERSION}" >&2
+exit 1

.ci/appveyor_run_tests.ps1

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+set -e -x
+
+export PATH="$(pwd)/.dotnet:${PATH}"
+
+python -m pip install -U -e .[dev]
+python setup.py webhost

.ci/appveyor_tests.bat

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+set -e -x
+
+mkdir .dotnet
+wget https://raw.githubusercontent.com/dotnet/cli/80d542b8f4eff847a0f72dc8f2c2a29851272778/scripts/obtain/dotnet-install.sh
+chmod +x dotnet-install.sh
+./dotnet-install.sh --version ${DOTNET_VERSION} --install-dir .dotnet
+
+.dotnet/dotnet --info
+python --version

.ci/linux_build.sh

@@ -2,7 +2,6 @@
 
 set -e -x
 
-dotnet --version
-python --version
+export PATH="$(pwd)/.dotnet:${PATH}"
 
 python setup.py test

.ci/linux_install.sh

@@ -0,0 +1,2 @@
+python -m pip install -U -e .[dev]
+python setup.py webhost

.ci/travis_tests.sh renamed to .ci/linux_tests.sh

@@ -0,0 +1,3 @@
+python .ci\appveyor_setup_worker.py > worker_path
+set /p PYAZURE_WORKER_DIR=<worker_path
+python setup.py test

.ci/travis_install.sh

@@ -1,9 +1,13 @@
 dist: trusty
 
+env:
+    - DOTNET_CLI_TELEMETRY_OPTOUT=1 DOTNET_VERSION=2.1.300
+
 branches:
     only:
         - master
         - dev
+        - ci
 
 language: python
 python:
@@ -17,14 +21,16 @@ addons:
 
         packages:
             - libunwind8
-            - dotnet-sdk-2.1.300
             - azure-functions-core-tools
 
 cache:
     pip: true
 
+before_install:
+    - .ci/linux_install.sh
+
 install:
-    - .ci/travis_install.sh
+    - .ci/linux_build.sh
 
 script:
-    - .ci/travis_tests.sh
+    - .ci/linux_tests.sh