Changes from comments.
Changes from comments.

- Move private instance variable.
- Reset errorMessage.
- See https://github.com/Seldaek/monolog/pull/248

Stype/monolog,deguif/monolog,chinaweilu/monolog,printerpam/monolog,aeryaguzov/monolog,thiagotalma/monolog,rs/monolog,nike-17/monolog,esalter/monolog,webwlsong/monolog,KevinMGranger/monolog,pomaxa/monolog,JeroenDeDauw/monolog,netgusto/monolog,cherrytech/monolog,yegortokmakov/monolog,yaoshanliang/monolog,dailymotion/monolog,JCook21/monolog,bd808/monolog,entwu/monolog,brendo/monolog,rap2hpoutre/monolog,prgTW/monolog,0x46616c6b/monolog,dracony/monolog,Sgoettschkes/monolog,dangnguyen27/monolog,ehough/epilog,oswaldderiemaecker/monolog,supre/monolog,staabm/monolog,gencer/monolog,vallejos/monolog,lyrixx/monolog,Seldaek/monolog,localheinz/monolog,mbrevda/monolog,tavrij/test