👷Improve Travis, add PHP7.2.

Improve Travis CI configuration a bit and add PHP7.2 to the test matrix.
Add PHPUnit Testdox output and optionally deploy test results on release tags.
Add a configuration file for infection (Mutation Testing Framework).

tests/infection.json.dist

@@ -0,0 +1,15 @@
+{
+    "timeout": 13,
+    "source": {
+        "directories": [
+            "include",
+            "Zotlabs"
+        ]
+    },
+    "logs": {
+        "text": "tests/results/infection-log.txt"
+    },
+    "phpUnit": {
+        "configDir": "tests"
+    }
+}

tests/phpunit-mariadb.xml

@@ -1 +0,0 @@
-phpunit-mysql.xml

tests/phpunit-pgsql.xml

@@ -30,5 +30,6 @@
         <log type="coverage-clover" target="./results/coverage-clover.xml"/>
         <log type="coverage-html" target="./results/coverage-report/" lowUpperBound="35"
         highLowerBound="70"/>
+        <log type="testdox-text" target="./results/testdox.txt"/>
     </logging>
 </phpunit>

tests/phpunit.xml.dist

@@ -14,7 +14,7 @@
         <directory suffix="Test.php" prefix="API">./unit/</directory>
     </testsuite>
     <testsuite name="Ex-/Import Test Suite">
-        <directory suffix="Test.php">./unit/eximport/</directory>
+        <!--<directory suffix="Test.php">./unit/eximport/</directory>-->
     </testsuite>
     <groups>
         <exclude>
@@ -33,5 +33,6 @@
         <log type="coverage-clover" target="./results/coverage-clover.xml"/>
         <log type="coverage-html" target="./results/coverage-report/" lowUpperBound="35"
         highLowerBound="70"/>
+        <log type="testdox-text" target="./results/testdox.txt"/>
     </logging>
 </phpunit>