Update documentation for 1.4

[danimo]

Now that the documentation is linked from the client

• add a small guide with screenshots
• add a description of syncing limitations (hard/softlinks, etc)
• update out-of-date comments
• describe new features in 1.4
• describe excluded/ignored files and syntax

[Pro]

For the exclude syntax can you provide the examples for the following cases? Thanks!

(assume I'm syncing /home/user)

• Exclude a specific directory (containing spaces) on root level (and all containing files) /home/user/foo Dir (but not /home/user/bar/foo Dir)
• Exclude all directories/files matching .git exactly (but not /home/user/fooDir.git)
• Exclude all directories/files containing foo in the name /home/user/fooDir and /home/user/dir foo)
• Exclude a specific file /home/user/bar/fileToExclude.txt

[danimo]

@Pro You are not really syncing your entire home directory, are you?

[Pro]

@danimo Yes, I am (not on linux, but on windows I'm syncing my whole data partition). Because I've a desktop PC and Laptop and want the data to be synced. Why, is this a bad idea (I made a backup of my data)?

[Pro]

Can you explain in more detail the following points:

• For the exclude file list, does it take the absolute path, relative (to sync base) path or only the filename to match the regex?
• Which regex operators are supported? Only '*' and '?' or also '^' and '$' for beginning and end, or what about '[a-z]'?
• Do we need to escape special characters. If we want to match foo.txtwe need to write foo\.txt
• How can I exclude a specific folder and all its content?

Thanks!