More CI is better CI. Add TravisCI. (#325)

A series of commits to see a) how to use TravisCI with docker and b) how the speed compares to CircleCI. Changes also include: 

* Reducing merge builds in both TravisCI & Appveyor.
* Update build scripts for OpenSSL & FreeTDS to do cleanup.

.travis.yml

@@ -0,0 +1,27 @@
+sudo: required
+cache: bundler
+services:
+  - docker
+env:
+  global:
+    - TESTOPTS="-v"
+    - TINYTDS_UNIT_HOST=localhost
+rvm:
+  - 2.1.9
+  - 2.2.5
+  - 2.3.1
+before_install:
+  - export PATH=/opt/local/bin:$PATH
+  - docker info
+  - sudo ./test/bin/setup.sh
+  - sudo ./test/bin/install-openssl.sh
+  - openssl version
+  - sudo ./test/bin/install-freetds.sh
+  - tsql -C
+install:
+  - export PATH=/opt/local/bin:$PATH
+  - gem install bundler
+  - bundle --version
+  - bundle install
+script:
+  - bundle exec rake

appveyor.yml

@@ -5,6 +5,7 @@ init:
   - SET TESTOPTS='-v'
 clone_depth: 5
 skip_tags: true
+skip_branch_with_pr: true
 matrix:
   fast_finish: true
 install:

test/bin/install-freetds.sh

@@ -15,3 +15,6 @@ cd freetds-$FREETDS_VERSION
             --with-tdsver=7.3
 make
 make install
+cd ..
+rm -rf freetds-$FREETDS_VERSION
+rm freetds-$FREETDS_VERSION.tar.gz

test/bin/install-openssl.sh

@@ -13,3 +13,6 @@ cd openssl-$OPENSSL_VERSION
 ./config --prefix=/opt/local
 make
 make install
+cd ..
+rm -rf openssl-$OPENSSL_VERSION
+rm openssl-$OPENSSL_VERSION.tar.gz

test/bin/setup.sh

@@ -1,4 +1,6 @@
 #!/usr/bin/env bash
+
+set -x
 set -e
 
 docker pull metaskills/mssql-server-linux-tinytds