Document interactions between lexima and neocomplete

[gotgenes]

In issue #65, @cohama said

In the past, I introduced some codes to hide popup menu forcely because some auto completion plugins (e.g. neocomplete) conflict with lexima.vim.

and

If you use any auto completion plugin, conflicts lexima's one.
It requires more time to solve both 2 problems simultaneously.

I recently started using neocomplete. I would like to know more about the interactions between lexima and neocomplete. I can see from this search there has been discussion of the two, but I don't find any documentation in lexima's Vim documentation. I'm especially interested in how users can minimize the negative interactions between these plugins.

For example, does the order of loading the plugins matter (e.g., do I need to load lexima before I load neocomplete, or vice versa)?

If I want to define <CR> behavior in the insert mode popup completion, as described in this comment,

imap <expr> <CR> pumvisible() ? "\<C-y>" : "\<CR>"

does this need to be defined after setting some configurations for lexima e.g.,

let g:lexima_no_default_rules = 1
call lexima#set_default_rules()

or can it be defined before those lexima configurations? (It seems like it must happen after lexima configuration.)