Internal improvements, mostly around custom parsing.
- Added ability to change User-Agent for custom sites. For instance it allows to switch (in case of need) to mobile version.
- Added generic url-converter for custom url mapping. This is useful for tricky sites where the article link should be derived.
- Excluded element in custom parsers can be attribute value in addition to class name and id.
- DKIM was disabled for now, seems to make some sort of incomplete signature
- Development migrated to IntelliJ IDEA