Adding more config params to MessDetector

[jlaso]

Often you going to need to explicitly pass Mess Detector without minimum-priority parameter or with a specific one.
This PR solves that cases.

[jlaso]

That is the result for a file that has problems with my PmdRules.xml

command used:

phpmd MyMDtest.php text PmdRules.xml --minimumpriority 1

output:

none (that means all it's okay)

---

Now removing the --minimumpriority clause

phpmd MyMDtest.php text PmdRules.xml

output:

MyMDtest.php:42 The method generateCollection() has an NPath complexity of 1802. The configured NPath complexity threshold is 200.
MyMDtest.php:114 The method generateEnvironment() has an NPath complexity of 15625. The configured NPath complexity threshold is 200.

---

The file of rules I am using is

<?xml version="1.0"?>
<ruleset name="Mytest Ruleset" xmlns="http://pmd.sf.net/ruleset/1.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://pmd.sf.net/ruleset/1.0.0 http://pmd.sf.net/ruleset_xml_schema.xsd"
         xsi:noNamespaceSchemaLocation="http://pmd.sf.net/ruleset_xml_schema.xsd">
    <description>
        Mytest ruleset.
    </description>
    <rule ref="rulesets/design.xml"/>
    <rule ref="rulesets/unusedcode.xml"/>
    <rule ref="rulesets/codesize.xml"/>


    <rule ref="rulesets/naming.xml">
        <exclude name="LongVariable"/>
        <exclude name="ShortVariable"/>
        <exclude name="ShortMethodName"/>
        <exclude name="BooleanGetMethodName"/>
    </rule>

    <rule ref="rulesets/naming.xml/ShortVariable"
          since="0.2"
          message="Avoid variables with short names like {0}. Minimum length is {1}."
          class="PHPMD\Rule\Naming\ShortVariable"
          externalInfoUrl="http://phpmd.org/rules/naming.html#shortvariable">
        <priority>3</priority>
        <properties>
            <property name="minimum" description="Minimum length for a variable, property or parameter name" value="3"/>
            <property name="exceptions" value="id,q,w,i,j,v,e,f,fp,em,qb"/>
        </properties>
    </rule>

    <rule ref="rulesets/naming.xml/LongVariable"
          since="0.2"
          message="Avoid excessively long variable names like {0}. Keep variable name length under {1}."
          class="PHPMD\Rule\Naming\LongVariable"
          externalInfoUrl="http://phpmd.org/rules/naming.html#longvariable">
        <description>
            Detects when a field, formal or local variable is declared with a long name.
        </description>
        <priority>3</priority>
        <properties>
            <property name="maximum" description="The variable length reporting threshold" value="25"/>
        </properties>
    </rule>

    <rule ref="rulesets/codesize.xml/CyclomaticComplexity">
        <priority>1</priority>
        <properties>
            <property name="reportLevel" value="10"/>
        </properties>
    </rule>
</ruleset>

[bruli]

Added in last release.