GitBucketDataStore: Don't store too large files

(from github.com/keiichiw)
If a file is larger than 10MB, org.codelibs.fess.crawler.exception.MaxLengthExceededException occurs.


Reported by @shiena. (ref)

(from github.com/MajidSafari)
The setting is in app/WEB-INF/classes/crawler/contentLength.xml.

<property name="defaultMaxLength">10485760</property><!-- 10M -->

(from github.com/keiichiw)
@MajidSafari Thanks!