Release v0.1.0

Features

• Focused crawler based on configuration of xpath rules.
• Crawler configuration editor, a web based json editor.
• Concurrency crawling by goroutines.
• Multiple crawlers support, each crawler has its own priority.
• Crawled items could be processed further by arbitrary javascript codes.
• Crawled items could be saved to configured ElasticSearch server automatically.
• Support incremental crawling.
• Dashboard for monitoring system loads.