For #36 - added dialog, import servlet
Added log viewer
For #36 - Implemented position parsing
For #36 - implemented positions persisting
For #36 - added progress message box
For #36 - restricted users from importing positions when device management is disabled
For #36 - updated README with new GPX import feature
For #36 - rollback transaction on IOException
For #36 - added second date format without millis
Merge branch 'dev' into gpx_import

Conflicts:
	README.md
	src/main/java/org/traccar/web/client/i18n/Messages.java
	src/main/java/org/traccar/web/server/model/GuiceServletConfig.java
	src/main/resources/org/traccar/web/client/i18n/Messages.properties
	src/main/resources/org/traccar/web/client/i18n/Messages_ru.properties