Merge pull request LaraPalCom#121 from hackel/patch-1

Add sitemap service alias to provides method to prevent BindingResolutionException

wip issue #116

updated readme

wip LaraPalCom#90

updated xsl styles

updated Sitemap class

- render protection (don't render sitemap with >50000 elements)
- option to force using a size limits for the number of elements in a
sitemap in the store() method, instead of default splitting of bigger
sitemaps to smaller sitemaps with sitemapindex
- memory leak fix (caching for file generation, clear unneeded
resources)
- fixed wrong file extension of html/txt generated files

version 2.5.6

version 2.4.20

version 2.5.5

version 2.4.19