Added capability to interpret pattern as absolute path (fixes #10)

```java
if (
(allureResultDirectoryList.length == 0)
&& (resultsPattern.length == 1)
&& (resultsPattern[0] != null)
){
String absolutePath = resultsPattern[0];
File absolutePathFile = new File(absolutePath);
if (absolutePathFile.exists()){
logger.message(String.format("using results pattern %s as absolute path", absolutePath));
allureResultDirectoryList = new File[]{absolutePathFile};
}
}
```